diff --git a/app/Http/Controllers/RegularContractCreateController.php b/app/Http/Controllers/RegularContractCreateController.php
index abf44ad..8945303 100644
--- a/app/Http/Controllers/RegularContractCreateController.php
+++ b/app/Http/Controllers/RegularContractCreateController.php
@@ -816,14 +816,21 @@ class RegularContractCreateController extends Controller
             return redirect('/login');
         }
 
-        // 期間選択チェック
-        $request->validate([
+        $contract_id = $request->input('contract_id');
+
+        $validator = Validator::make($request->all(), [
             'month' => 'required',
         ], [
             'month.required' => '契約期間が選択されていません。',
         ]);
 
-        $contract_id = $request->input('contract_id');
+        if ($validator->fails()) {
+            // ここでリダイレクト先を明示的に指定
+            return redirect()->route('regular_contract.create_confirm_next', ['contract_id' => $contract_id])
+                ->withErrors($validator)
+                ->withInput();
+        }
+
         $month = $request->input('month');
         $price = $request->input('price_' . $month);