diff --git a/backend/app/Http/Controllers/Api/FatherRelationsController.php b/backend/app/Http/Controllers/Api/FatherRelationsController.php
index 486250bd..da779759 100644
--- a/backend/app/Http/Controllers/Api/FatherRelationsController.php
+++ b/backend/app/Http/Controllers/Api/FatherRelationsController.php
@@ -9,7 +9,7 @@ use Illuminate\Support\Facades\Log;
 use App\Models\FatherRelation;
 
 class FatherRelationsController extends Controller {
-    public function register (Register $r) {
+    public function register (Request $r) {
         if (!isset($r->father_id) || !isset($r->identity)) {
             return ['status_code' => 400, 'error_messages' => ['子の追加に失敗しました。']];
         }