diff --git a/backend/app/Http/Controllers/Api/FatherRelationsController.php b/backend/app/Http/Controllers/Api/FatherRelationsController.php
index da779759..709051dd 100644
--- a/backend/app/Http/Controllers/Api/FatherRelationsController.php
+++ b/backend/app/Http/Controllers/Api/FatherRelationsController.php
@@ -14,6 +14,14 @@ class FatherRelationsController extends Controller {
             return ['status_code' => 400, 'error_messages' => ['子の追加に失敗しました。']];
         }
 
+        $validate = Validator::make($r->all(), [
+            'identity' => 'required|max:20|alpha_num',
+        ]);
+
+        if ($validate->fails()) {
+            return ['status_code' => 422, 'error_messages' => $validate->errors()];
+        }
+
         if (null === ($child = Child::select('id')->where('identity', $r->identity)->first())) {
             return ['status_code' => 400, 'error_messages' => ['子の追加に失敗しました。']];
         }
@@ -43,6 +51,14 @@ class FatherRelationsController extends Controller {
             return ['status_code' => 400, 'error_messages' => ['子の入社日の更新に失敗しました。']];
         }
 
+        $validate = Validator::make($r->all(), [
+            'hire_at' => 'date',
+        ]);
+
+        if ($validate->fails()) {
+            return ['status_code' => 422, 'error_messages' => $validate->errors()];
+        }
+
         $update = [
             'hire_at' => date('Y-m-d H:i:s', strtotime($r->hire_at)),
         ];