diff --git a/app/Models/City.php b/app/Models/City.php
index 97cb3b1..ccfbd51 100644
--- a/app/Models/City.php
+++ b/app/Models/City.php
@@ -7,9 +7,9 @@ use Illuminate\Database\Eloquent\Model;
 class City extends Model
 {
     protected $table = 'city';
-    public $timestamps = true;
-
-    protected $primaryKey = 'city_id'; 
+    protected $primaryKey = 'city_id';
+    protected $keyType = 'int';
+    public $incrementing = true;
     protected $fillable = [
         'city_id',
         'city_name',
@@ -23,12 +23,14 @@ class City extends Model
     /**
      * 都市のリストを取得
      */
-    public static function getList()
+    public static function getList(?int $operatorId = null): array
     {
-        return self::all();
+        return static::query()
+            ->when($operatorId, fn ($q) => $q->where('operator_id', $operatorId))
+            ->orderBy('city_name')
+            ->pluck('city_name', 'city_id')
+            ->toArray();
     }
     
     
-    
-
-}
+}