diff --git a/app/Http/Controllers/Admin/CityController.php b/app/Http/Controllers/Admin/CityController.php
index 121eb8d..82c82a7 100644
--- a/app/Http/Controllers/Admin/CityController.php
+++ b/app/Http/Controllers/Admin/CityController.php
@@ -1,44 +1,50 @@
 <?php
 
+declare(strict_types=1);
+
 namespace App\Http\Controllers\Admin;
 
-use Illuminate\Http\Request;
 use App\Http\Controllers\Controller;
-use Illuminate\Support\Facades\Validator;
-use Illuminate\Support\Facades\DB;
+use App\Http\Requests\CityRequest;
 use App\Models\City;
+use App\Services\CityService;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+use Illuminate\View\View;
 
-class CityController extends Controller
+final class CityController extends Controller
 {
-    public function list(Request $request)
+    public function index(Request $request, CityService $service): View|RedirectResponse
     {
-        $sort = $request->input('sort', 'city_id');
-        $sortType = $request->input('sort_type', 'asc');
-        $page = $request->get('page', 1);
+        $sort = (string) $request->input('sort', 'city_id');
+        $sortType = (string) $request->input('sort_type', 'asc');
+        $page = (int) $request->get('page', 1);
 
-        $query = City::query();
-
-        if ($request->filled('city_name')) {
-            $query->where('city_name', 'like', '%' . $request->input('city_name') . '%');
+        // ソート許可（安全 + 規約）
+        $sortable = ['city_id', 'city_name', 'print_layout', 'city_remarks', 'created_at', 'updated_at'];
+        if (!in_array($sort, $sortable, true)) {
+            $sort = 'city_id';
         }
 
-        // 排序处理
-        if (!empty($sort)) {
-            $query->orderBy($sort, $sortType);
+        $sortType = strtolower($sortType);
+        if (!in_array($sortType, ['asc', 'desc'], true)) {
+            $sortType = 'asc';
         }
 
-        $list = $query->paginate(20);
+        $list = $service->paginateList(
+            $request->input('city_name'),
+            $sort,
+            $sortType
+        );
 
-        // 页码越界处理
         if ($list->total() > 0 && $page > $list->lastPage()) {
-            return redirect()->route('city', [
+            return redirect()->route('cities.index', [
                 'sort' => $sort,
                 'sort_type' => $sortType,
             ]);
         }
 
-        return view('admin.CityMaster.list', [
-            'isMethodPost' => $request->isMethod('post'),
+        return view('admin.cities.index', [
             'sort' => $sort,
             'sort_type' => $sortType,
             'list' => $list,
@@ -46,129 +52,58 @@ class CityController extends Controller
         ]);
     }
 
-    public function add(Request $request)
+    public function create(): View
     {
-        $inputs = [
-            'city_name' => '',
-            'print_layout' => '',
-            'city_user' => '',
-            'city_remarks' => '',
-        ];
-
-        if ($request->isMethod('POST')) {
-            $rules = [
-                'city_name' => ['required', 'string', 'max:10', 'regex:/^[^ -~｡-ﾟ]+$/u'],
-                'print_layout' => ['required', 'string', 'max:10', 'regex:/^[^ -~｡-ﾟ]+$/u'],
-                'city_user' => ['required', 'string', 'max:10', 'regex:/^[^ -~｡-ﾟ]+$/u'],
-                'city_remarks' => ['nullable', 'string', 'max:20'],
-            ];
-            $messages = [
-                'city_name.required' => '市区名は必須です。',
-                'city_name.regex' => '市区名は全角で入力してください。',
-                'print_layout.required' => '印字レイアウトファイルは必須です。',
-                'print_layout.regex' => '印字レイアウトファイルは全角で入力してください。',
-                'city_user.required' => '顧客M入力不要フィールドIDは必須です。',
-                'city_user.regex' => '顧客M入力不要フィールドIDは全角で入力してください。',
-                'city_remarks.max' => '備考は20文字以内で入力してください。',
-            ];
-            $validator = Validator::make($request->all(), $rules, $messages);
-
-            $inputs = array_merge($inputs, $request->all());
-
-            if (!$validator->fails()) {
-                $maxId = DB::table('city')->max('city_id');
-                $newCityId = $maxId ? $maxId + 1 : 1;
-
-                $city = new City();
-                $city->city_id = $newCityId;
-                $city->fill($request->only([
-                    'city_name',
-                    'print_layout',
-                    'city_user',
-                    'city_remarks',
-                ]));
-
-                if ($city->save()) {
-                    $request->session()->flash('success', __('登録に成功しました'));
-                    return redirect()->route('city');
-                } else {
-                    $request->session()->flash('error', __('登録に失敗しました'));
-                }
-            } else {
-                $inputs['errorMsg'] = $validator->errors()->all();
-            }
-        }
-
-        return view('admin.CityMaster.add', $inputs);
-    }
-
-    public function edit(Request $request, $pk, $view = '')
-    {
-        $city = City::find($pk);
-        if (!$city) {
-            abort(404);
-        }
-
-        if ($request->isMethod('POST')) {
-            $rules = [
-                'city_name' => ['required', 'string', 'max:10', 'regex:/^[^ -~｡-ﾟ]+$/u'],
-                'print_layout' => ['required', 'string', 'max:10', 'regex:/^[^ -~｡-ﾟ]+$/u'],
-                'city_user' => ['required', 'string', 'max:10', 'regex:/^[^ -~｡-ﾟ]+$/u'],
-                'city_remarks' => ['nullable', 'string', 'max:20'],
-            ];
-            $messages = [
-                'city_name.required' => '市区名は必須です。',
-                'city_name.regex' => '市区名は全角で入力してください。',
-                'print_layout.required' => '印字レイアウトファイルは必須です。',
-                'print_layout.regex' => '印字レイアウトファイルは全角で入力してください。',
-                'city_user.required' => '顧客M入力不要フィールドIDは必須です。',
-                'city_user.regex' => '顧客M入力不要フィールドIDは全角で入力してください。',
-                'city_remarks.max' => '備考は20文字以内で入力してください。',
-            ];
-            $validator = Validator::make($request->all(), $rules, $messages);
-
-            if (!$validator->fails()) {
-                $city->fill($request->only([
-                    'city_name',
-                    'print_layout',
-                    'city_user',
-                    'city_remarks',
-                ]));
-
-                if ($city->save()) {
-                    $request->session()->flash('success', __('更新に成功しました'));
-                    return redirect()->route('city');
-                } else {
-                    $request->session()->flash('error', __('更新に失敗しました'));
-                }
-            } else {
-                return view('admin.CityMaster.edit', [
-                    'city' => $city,
-                    'errorMsg' => $validator->errors()->all(),
-                ]);
-            }
-        }
-
-        return view($view ?: 'admin.CityMaster.edit', [
-            'city' => $city,
+        return view('admin.cities.create', [
+            'record' => new City(),
         ]);
     }
 
-    public function info(Request $request, $pk)
+    public function store(CityRequest $request, CityService $service): RedirectResponse
     {
-        return $this->edit($request, $pk, 'CityMaster.info');
+        $service->create($request->validated());
+
+        return redirect()
+            ->route('cities.index')
+            ->with('success', __('登録に成功しました'));
     }
 
-    public function delete(Request $request)
+    public function edit(int $id): View
     {
-        $arr_pk = $request->get('pk');
-        if (!$arr_pk) {
-            return redirect()->route('city')->with('error', __('削除する市区を選択してください。'));
-        }
-        if (City::destroy($arr_pk)) {
-            return redirect()->route('city')->with('success', __("削除が完了しました。"));
-        } else {
-            return redirect()->route('city')->with('error', __('削除に失敗しました。'));
-        }
+        $city = City::findOrFail($id);
+
+        return view('admin.cities.edit', [
+            'record' => $city,
+        ]);
     }
-}
\ No newline at end of file
+
+    public function update(CityRequest $request, int $id, CityService $service): RedirectResponse
+    {
+        $city = City::findOrFail($id);
+
+        $service->update($city, $request->validated());
+
+        return redirect()
+            ->route('cities.index')
+            ->with('success', __('更新に成功しました'));
+    }
+
+    public function destroy(Request $request): RedirectResponse
+    {
+        $ids = $request->input('pk');
+
+        // pk が単体でも配列でも受けられるようにする（編集画面/一覧画面両対応）
+        if ($ids === null || $ids === '' || $ids === []) {
+            return redirect()
+                ->route('cities.index')
+                ->with('error', __('削除する市区を選択してください。'));
+        }
+        $ids = is_array($ids) ? $ids : [$ids];
+
+        $deleted = City::destroy($ids);
+
+        return $deleted
+            ? redirect()->route('cities.index')->with('success', __('削除が完了しました。'))
+            : redirect()->route('cities.index')->with('error', __('削除に失敗しました。'));
+    }
+}
diff --git a/app/Http/Requests/CityRequest.php b/app/Http/Requests/CityRequest.php
new file mode 100644
index 0000000..073beb5
--- /dev/null
+++ b/app/Http/Requests/CityRequest.php
@@ -0,0 +1,39 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+final class CityRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+       
+        return [
+            'city_name'    => ['required', 'string', 'max:20', 'regex:/^[^ -~｡-ﾟ]+$/u'], 
+            'print_layout' => ['required', 'string', 'max:255', 'regex:/^[A-Za-z0-9]+$/'], 
+            'city_remarks' => ['nullable', 'string', 'max:255'],
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'city_name.required'    => '市区名は必須です。',
+            'city_name.regex'       => '市区名は全角文字で入力してください。',
+            'city_name.max'         => '市区名は20文字以内で入力してください。',
+
+            'print_layout.required' => '印字レイアウトファイルは必須です。',
+            'print_layout.regex'    => '印字レイアウトファイルは半角英数字で入力してください。',
+            'print_layout.max'      => '印字レイアウトファイルは255文字以内で入力してください。',
+
+            'city_remarks.max'      => '備考は255文字以内で入力してください。',
+        ];
+    }
+}
diff --git a/app/Services/CityService.php b/app/Services/CityService.php
new file mode 100644
index 0000000..f1ea604
--- /dev/null
+++ b/app/Services/CityService.php
@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services;
+
+use App\Models\City;
+use App\Utils;
+use Illuminate\Contracts\Pagination\LengthAwarePaginator;
+
+final class CityService
+{
+    public function paginateList(
+        ?string $cityName,
+        string $sort,
+        string $sortType
+    ): LengthAwarePaginator {
+        $query = City::query();
+
+        if ($cityName !== null && $cityName !== '') {
+            $query->where('city_name', 'like', '%' . $cityName . '%');
+        }
+
+        $query->orderBy($sort, $sortType);
+
+        return $query->paginate(Utils::item_per_page);
+    }
+
+    public function create(array $validated): City
+    {
+        return City::create($this->payload($validated));
+    }
+
+    public function update(City $city, array $validated): City
+    {
+        $city->fill($this->payload($validated));
+        $city->save();
+
+        return $city;
+    }
+
+    private function payload(array $validated): array
+    {
+        return [
+            'city_name'    => $validated['city_name'],
+            'print_layout' => $validated['print_layout'],
+            'city_remarks' => $validated['city_remarks'] ?? null,
+        ];
+    }
+}
diff --git a/resources/views/admin/cities/_form.blade.php b/resources/views/admin/cities/_form.blade.php
index 29620fa..69d2518 100644
--- a/resources/views/admin/cities/_form.blade.php
+++ b/resources/views/admin/cities/_form.blade.php
@@ -89,20 +89,6 @@
             </div>
         </div>
 
-        <!-- {{-- ▼ 顧客M入力不要フィールドID --}}
-        <div class="form-group col-3">
-            <label class="form-label required">{{ __('顧客M入力不要フィールドID') }}</label>
-        </div>
-        <div class="form-group col-9">
-            <div class="input-group">
-                <input type="text"
-                       name="city_user"
-                       class="form-control form-control-lg"
-                       placeholder="{{ __('顧客M入力不要フィールドID') }}"
-                       value="{{ old('city_user', $record->city_user ?? ($city_user ?? '')) }}">
-            </div>
-        </div> -->
-
         {{-- ▼ 備考 --}}
         <div class="form-group col-3">
             <label>{{ __('備考') }}</label>
diff --git a/resources/views/admin/cities/add.blade.php b/resources/views/admin/cities/create.blade.php
similarity index 73%
rename from resources/views/admin/cities/add.blade.php
rename to resources/views/admin/cities/create.blade.php
index 6235b11..f9fcf87 100644
--- a/resources/views/admin/cities/add.blade.php
+++ b/resources/views/admin/cities/create.blade.php
@@ -11,9 +11,11 @@
                 </div>
                 <div class="col-lg-6">
                     <ol class="breadcrumb float-sm-right text-sm">
-                        <li class="breadcrumb-item"><a href="{{ route('home') }}">ホーム</a></li>
                         <li class="breadcrumb-item">
-                            <a href="{{ route('city') }}">市区マスタ</a>
+                            <a href="{{ route('home') }}">ホーム</a>
+                        </li>
+                        <li class="breadcrumb-item">
+                            <a href="{{ route('cities.index') }}">市区マスタ</a>
                         </li>
                         <li class="breadcrumb-item active">新規</li>
                     </ol>
@@ -30,9 +32,10 @@
                 <div class="col-lg-12">
                     <div class="card">
 
+                        {{-- 新規登録フォーム --}}
                         <form id="form_add"
-                              method="post"
-                              action="{{ route('city_add') }}?back={{ urlencode(request()->get('back', request()->fullUrl())) }}"
+                              method="POST"
+                              action="{{ route('cities.store') }}?back={{ urlencode(request()->get('back', request()->fullUrl())) }}"
                               enctype="multipart/form-data">
                             @csrf
 
diff --git a/resources/views/admin/cities/edit.blade.php b/resources/views/admin/cities/edit.blade.php
index 574cd86..b28b62c 100644
--- a/resources/views/admin/cities/edit.blade.php
+++ b/resources/views/admin/cities/edit.blade.php
@@ -13,7 +13,7 @@
                     <ol class="breadcrumb float-sm-right text-sm">
                         <li class="breadcrumb-item"><a href="{{ route('home') }}">ホーム</a></li>
                         <li class="breadcrumb-item">
-                            <a href="{{ route('city') }}">市区マスタ</a>
+                            <a href="{{ route('cities.index') }}">市区マスタ</a>
                         </li>
                         <li class="breadcrumb-item active">編集</li>
                     </ol>
@@ -33,9 +33,9 @@
 
                         {{-- 編集フォーム --}}
                         <form id="form_edit"
-                            action="{{ route('city_edit', ['id' => $record->city_id]) }}?back={{ urlencode(request()->get('back', request()->fullUrl())) }}"
-                            method="POST"
-                            enctype="multipart/form-data">
+                              action="{{ route('cities.update', ['id' => $record->city_id]) }}?back={{ urlencode(request()->get('back', request()->fullUrl())) }}"
+                              method="POST"
+                              enctype="multipart/form-data">
                             @csrf
 
                             @include('admin.cities._form', [
@@ -46,7 +46,7 @@
 
                         {{-- 削除フォーム（非表示） --}}
                         <form id="form_delete"
-                              action="{{ route('city_delete') }}"
+                              action="{{ route('cities.destroy') }}"
                               method="POST"
                               style="display:none;">
                             @csrf
@@ -59,5 +59,4 @@
 
         </div>
     </section>
-    <!-- /.content -->
 @endsection
diff --git a/resources/views/admin/cities/list.blade.php b/resources/views/admin/cities/index.blade.php
similarity index 93%
rename from resources/views/admin/cities/list.blade.php
rename to resources/views/admin/cities/index.blade.php
index 34619dd..0450563 100644
--- a/resources/views/admin/cities/list.blade.php
+++ b/resources/views/admin/cities/index.blade.php
@@ -24,7 +24,7 @@
         <div class="container-fluid">
 
             {{-- 並び替え用 hidden --}}
-            <form method="GET" action="{{ route('city') }}" id="list-form">
+            <form method="GET" action="{{ route('cities.index') }}" id="list-form">
                 <input type="hidden" name="sort" id="sort" value="{{ $sort ?? '' }}">
                 <input type="hidden" name="sort_type" id="sort_type" value="{{ $sort_type ?? '' }}">
             </form>
@@ -33,7 +33,7 @@
             <div class="col-lg-12 mb-3 px-0">
                 <button type="button"
                         class="btn btn-sm btn-primary mr10"
-                        onclick="location.href='{{ route('city_add') }}?back={{ urlencode(request()->fullUrl()) }}'">
+                        onclick="location.href='{{ route('cities.create') }}?back={{ urlencode(request()->fullUrl()) }}'">
                     新規
                 </button>
 
@@ -62,7 +62,7 @@
                 </div>
             </div>
 
-            {{-- ▼ フラッシュメッセージ（利用者分類マスタと同じ見せ方） --}}
+            {{-- ▼ フラッシュメッセージ --}}
             <div class="form col-lg-12 px-0">
                 @if(Session::has('success'))
                     <div class="alert alert-success alert-dismissible">
@@ -85,7 +85,7 @@
             {{-- ▼ テーブル --}}
             <div class="col-lg-12 mb20 px-0">
                 <div class="table-responsive">
-                    <form id="form_delete" method="POST" action="{{ route('city_delete') }}">
+                    <form id="form_delete" method="POST" action="{{ route('cities.destroy') }}">
                         @csrf
 
                         <table class="table table-bordered dataTable text-nowrap">
@@ -118,7 +118,7 @@
                                         <td style="background-color:#faebd7;">
                                             <div class="d-flex align-items-center">
                                                 <input type="checkbox" name="pk[]" value="{{ $city->city_id }}">
-                                                <a href="{{ route('city_edit', ['id' => $city->city_id]) }}?back={{ urlencode(request()->fullUrl()) }}"
+                                                <a href="{{ route('cities.edit', ['id' => $city->city_id]) }}?back={{ urlencode(request()->fullUrl()) }}"
                                                    class="btn btn-sm btn-outline-primary ml10">
                                                     編集
                                                 </a>
diff --git a/routes/web.php b/routes/web.php
index a829c36..aec62dd 100644
--- a/routes/web.php
+++ b/routes/web.php
@@ -151,12 +151,45 @@ Route::middleware('auth')->group(function () {
     // sou end
 
     // ou start
-    // 市区マスタ
-    Route::match(['get', 'post'], '/city', [CityController::class, 'list'])->name('city');
-    Route::match(['get', 'post'], '/city/add', [CityController::class, 'add'])->name('city_add');
-    Route::match(['get', 'post'], '/city/edit/{id}', [CityController::class, 'edit'])->where(['id' => '[0-9]+'])->name('city_edit');
-    Route::match(['get', 'post'], '/city/info/{id}', [CityController::class, 'info'])->where(['id' => '[0-9]+'])->name('city_info');
-    Route::match(['get', 'post'], '/city/delete', [CityController::class, 'delete'])->name('city_delete');
+    // // 市区マスタ
+    // Route::match(['get', 'post'], '/city', [CityController::class, 'list'])->name('city');
+    // Route::match(['get', 'post'], '/city/add', [CityController::class, 'add'])->name('city_add');
+    // Route::match(['get', 'post'], '/city/edit/{id}', [CityController::class, 'edit'])->where(['id' => '[0-9]+'])->name('city_edit');
+    // Route::match(['get', 'post'], '/city/info/{id}', [CityController::class, 'info'])->where(['id' => '[0-9]+'])->name('city_info');
+    // Route::match(['get', 'post'], '/city/delete', [CityController::class, 'delete'])->name('city_delete');
+    
+    // 市区マスタ（cities.*）
+    Route::prefix('cities')->group(function () {
+
+        // 一覧（画面）
+        Route::get('/', [\App\Http\Controllers\Admin\CityController::class, 'index'])
+            ->name('cities.index');
+
+        // 新規（画面）
+        Route::get('/create', [\App\Http\Controllers\Admin\CityController::class, 'create'])
+            ->name('cities.create');
+
+        // 新規（登録）
+        Route::post('/', [\App\Http\Controllers\Admin\CityController::class, 'store'])
+            ->name('cities.store');
+
+        // 編集（画面）
+        Route::get('/{id}/edit', [\App\Http\Controllers\Admin\CityController::class, 'edit'])
+            ->whereNumber('id')
+            ->name('cities.edit');
+
+        // 編集（更新）
+        Route::post('/{id}', [\App\Http\Controllers\Admin\CityController::class, 'update'])
+            ->whereNumber('id')
+            ->name('cities.update');
+
+        // 削除（複数削除 pk[]）
+        Route::post('/delete', [\App\Http\Controllers\Admin\CityController::class, 'destroy'])
+            ->name('cities.destroy');
+    });
+
+
+
 
     // 駐輪場マスタ
     Route::get('/parks', [ParkController::class, 'list'])->name('parks');