diff --git a/app/Http/Controllers/RegularContractCreateController.php b/app/Http/Controllers/RegularContractCreateController.php
index f139897..857b668 100644
--- a/app/Http/Controllers/RegularContractCreateController.php
+++ b/app/Http/Controllers/RegularContractCreateController.php
@@ -98,11 +98,15 @@ class RegularContractCreateController extends Controller
         $parks_table = $query->skip(($page - 1) * $perPage)->take($perPage)->get();
 
         if ($sort === 'park_ruby' || $sort === 'station_name_ruby') {
-            setlocale(LC_COLLATE, 'ja_JP.utf8');
+            $locale_result = setlocale(LC_COLLATE, 'ja_JP.utf8');
+            \Log::info('setlocale result: ' . $locale_result);
+
             $parks_table = $parks_table->sort(function ($a, $b) use ($order, $sort) {
                 // null対策
                 $a_val = $a->$sort ?? '';
                 $b_val = $b->$sort ?? '';
+                // 比較値もログで確認（本番では消してOK）
+                \Log::info("compare: $a_val vs $b_val");
                 return $order === 'asc'
                     ? strcoll($a_val, $b_val)
                     : strcoll($b_val, $a_val);