diff --git a/app/Http/Controllers/Admin/ReductionConfirmMasterController.php b/app/Http/Controllers/Admin/ReductionConfirmMasterController.php
index 90dacf7..0a5ad3b 100644
--- a/app/Http/Controllers/Admin/ReductionConfirmMasterController.php
+++ b/app/Http/Controllers/Admin/ReductionConfirmMasterController.php
@@ -15,7 +15,7 @@ class ReductionConfirmMasterController extends Controller
      * @param Request $request park_id をクエリパラメータで受け取る
      * @return \Illuminate\View\View
      */
-    public function index(Request $request)
+    public function list(Request $request)
     {
         // park_id の検証
         $request->validate([
@@ -47,7 +47,7 @@ class ReductionConfirmMasterController extends Controller
             )
             ->paginate(50);
 
-        return view('admin.reduction_confirm.index', [
+        return view('admin.reduction_confirm.list', [
             'park' => $park,
             'parkId' => $parkId,
             'reductionData' => $reductionData,
@@ -65,6 +65,8 @@ class ReductionConfirmMasterController extends Controller
         // バリデーション
         $validated = $request->validate([
             'park_id' => 'required|integer|exists:park,park_id',
+            'row_user_categoryid' => 'array',
+            'row_user_categoryid.*' => 'integer',
             'reduction_confirm_type' => 'array',
             'reduction_confirm_type.*' => 'in:0,1,2',
         ], [
@@ -75,27 +77,34 @@ class ReductionConfirmMasterController extends Controller
         ]);
 
         $parkId = (int) $validated['park_id'];
-        $types = $validated['reduction_confirm_type'] ?? [];
-        
+
         // ログイン中のオペレータID取得
         $opeId = auth()->user()->ope_id ?? null;
 
+        // POST された配列は index ベースで来るため、row_user_categoryid のインデックスに合わせてマッピングする
+        $rowUserCategory = $request->input('row_user_categoryid', []);
+        $types = $request->input('reduction_confirm_type', []);
+
         try {
-            // トランザクションで更新処理を実行
-            DB::transaction(function () use ($parkId, $types, $opeId) {
-                foreach ($types as $userCategoryId => $type) {
+            DB::transaction(function () use ($parkId, $rowUserCategory, $types, $opeId) {
+                foreach ($rowUserCategory as $idx => $userCategoryId) {
+                    if (!isset($types[$idx])) {
+                        continue;
+                    }
+                    $type = (int) $types[$idx];
+
                     DB::table('reduction_confirm')
                         ->where('park_id', $parkId)
                         ->where('user_categoryid', (int) $userCategoryId)
                         ->update([
-                            'reduction_confirm_type' => (int) $type,
+                            'reduction_confirm_type' => $type,
                             'updated_at' => now(),
                             'ope_id' => $opeId,
                         ]);
                 }
             });
 
-            return redirect()->route('reduction_confirm.index', ['park_id' => $parkId])
+            return redirect()->route('reduction_confirm.list', ['park_id' => $parkId])
                 ->with('success', '減免確認マスタを更新しました。');
         } catch (\Exception $e) {
             \Log::error('ReductionConfirm update failed', [
diff --git a/routes/web.php b/routes/web.php
index 2608ba5..8f3c6ed 100644
--- a/routes/web.php
+++ b/routes/web.php
@@ -278,7 +278,7 @@ Route::middleware('auth')->group(function () {
     Route::match(['get', 'post'], '/usertypes/export', [UsertypeController::class, 'export'])->name('usertypes_export');
 
     // 減免確認マスタ
-    Route::get('/reduction-confirm-master', [ReductionConfirmMasterController::class, 'index'])->name('reduction_confirm.index');
+    Route::get('/reduction-confirm-master', [ReductionConfirmMasterController::class, 'list'])->name('reduction_confirm.list');
     Route::post('/reduction-confirm-master', [ReductionConfirmMasterController::class, 'store'])->name('reduction_confirm.store');