diff --git a/app/Http/Controllers/RegularContractCreateController.php b/app/Http/Controllers/RegularContractCreateController.php
index bfcf7cd..64edca5 100644
--- a/app/Http/Controllers/RegularContractCreateController.php
+++ b/app/Http/Controllers/RegularContractCreateController.php
@@ -99,29 +99,13 @@ class RegularContractCreateController extends Controller
         $parks_table = $query->skip(($page - 1) * $perPage)->take($perPage)->get();
 
         if ($sort === 'park_ruby' || $sort === 'station_name_ruby') {
-            $locales = [
-                'ja_JP.UTF-8',
-                'ja_JP.utf8',
-                'ja_JP',
-                'japanese',
-                'Japanese_Japan.932',
-                'Japanese_Japan',
-                'ja',
-            ];
-            foreach ($locales as $locale) {
-                $result = setlocale(LC_COLLATE, $locale);
-                \Log::info("setlocale try: {$locale} => {$result}");
-                if ($result !== false) {
-                    break;
-                }
-            }
-            $parks_table = $parks_table->sort(function ($a, $b) use ($order, $sort) {
-                // null対策
+            $collator = new \Collator('ja_JP');
+            $parks_table = $parks_table->sort(function ($a, $b) use ($order, $sort, $collator) {
                 $a_val = $a->$sort ?? '';
                 $b_val = $b->$sort ?? '';
                 return $order === 'asc'
-                    ? strcoll($a_val, $b_val)
-                    : strcoll($b_val, $a_val);
+                    ? $collator->compare($a_val, $b_val)
+                    : $collator->compare($b_val, $a_val);
             })->values();
         }