diff --git a/plugins/baser-core/src/Model/Table/SitesTable.php b/plugins/baser-core/src/Model/Table/SitesTable.php
index 51f2799a5d..e980776fbd 100644
--- a/plugins/baser-core/src/Model/Table/SitesTable.php
+++ b/plugins/baser-core/src/Model/Table/SitesTable.php
@@ -116,6 +116,16 @@ public function validationDefault(Validator $validator): Validator
                     'provider' => 'bc',
                     'message' => __d('baser_core', '識別名称は、半角英数・ハイフン（-）・アンダースコア（_）で入力してください。')
                 ]]);
+        $validator
+            ->scalar('alias')
+            ->maxLength('alias', 50, __d('baser_core', 'エイリアスは50文字以内で入力してください。'))
+            ->notEmptyString('alias', __d('baser_core', 'エイリアスを入力してください。'))
+            ->add('alias', [
+                'nameAlphaNumericPlus' => [
+                    'rule' => ['alphaNumericPlus'],
+                    'provider' => 'bc',
+                    'message' => __d('baser_core', 'エイリアスは、半角英数・ハイフン（-）・アンダースコア（_）で入力してください。')
+                ]]);
         $validator
             ->scalar('display_name')
             ->maxLength('display_name', 50, __d('baser_core', 'サイト名は50文字以内で入力してください。'))
@@ -742,7 +752,7 @@ public function save(
     ): EntityInterface|false {
         $success = parent::save($entity, $options);
         $request = Router::getRequest();
-        if($request) {
+        if($success && $request) {
             $session = Router::getRequest()->getSession();
             $currentSite = $session->read('BcApp.Admin.currentSite');
             if ($currentSite && $success->id === $currentSite->id) {
diff --git a/plugins/baser-core/src/Service/Admin/SitesAdminService.php b/plugins/baser-core/src/Service/Admin/SitesAdminService.php
index d989da311f..4d9bd15390 100644
--- a/plugins/baser-core/src/Service/Admin/SitesAdminService.php
+++ b/plugins/baser-core/src/Service/Admin/SitesAdminService.php
@@ -19,6 +19,7 @@
 use BaserCore\Annotation\Checked;
 use Cake\Core\Configure;
 use Cake\Datasource\EntityInterface;
+use Cake\Datasource\Paging\PaginatedInterface;
 use Cake\Routing\Router;
 use Cake\Utility\Inflector;
 
@@ -35,7 +36,7 @@ class SitesAdminService extends SitesService implements SitesAdminServiceInterfa
 
     /**
      * 一覧画面用のデータを取得する
-     * @param \Cake\ORM\ResultSet|\Cake\Datasource\ResultSetInterface $sites
+     * @param \Cake\ORM\ResultSet|\Cake\Datasource\ResultSetInterface|PaginatedInterface $sites
      * @return array
      * @checked
      * @noTodo
diff --git a/plugins/baser-core/src/Service/Admin/SitesAdminServiceInterface.php b/plugins/baser-core/src/Service/Admin/SitesAdminServiceInterface.php
index 57b922cd90..0c398e3af8 100644
--- a/plugins/baser-core/src/Service/Admin/SitesAdminServiceInterface.php
+++ b/plugins/baser-core/src/Service/Admin/SitesAdminServiceInterface.php
@@ -14,6 +14,7 @@
 use BaserCore\Annotation\NoTodo;
 use BaserCore\Annotation\Checked;
 use Cake\Datasource\EntityInterface;
+use Cake\Datasource\Paging\PaginatedInterface;
 
 /**
  * SitesAdminServiceInterface
@@ -23,7 +24,7 @@ interface SitesAdminServiceInterface
 
     /**
      * 一覧画面用のデータを取得する
-     * @param \Cake\ORM\ResultSet|\Cake\Datasource\ResultSetInterface $sites
+     * @param \Cake\ORM\ResultSet|\Cake\Datasource\ResultSetInterface|PaginatedInterface $sites
      * @return array
      * @checked
      * @noTodo
diff --git a/plugins/baser-core/tests/Factory/UserFactory.php b/plugins/baser-core/tests/Factory/UserFactory.php
index 3f97302419..563d128201 100644
--- a/plugins/baser-core/tests/Factory/UserFactory.php
+++ b/plugins/baser-core/tests/Factory/UserFactory.php
@@ -47,8 +47,8 @@ protected function setDefaultTemplate(): void
         $this->setDefaultData(function (Generator $faker) {
             return [
                 'name' => $faker->text(255),
-                'real_name_1' => $faker->text(50),
-                'real_name_2' => $faker->text(50),
+                'real_name_1' => $faker->text(5),
+                'real_name_2' => $faker->text(5),
                 'password' => 'password',
                 'email' => $faker->email(),
                 'nickname' => '',
diff --git a/plugins/baser-core/tests/TestCase/Model/Table/SitesTableTest.php b/plugins/baser-core/tests/TestCase/Model/Table/SitesTableTest.php
index 09426048ce..92e2acd8d0 100644
--- a/plugins/baser-core/tests/TestCase/Model/Table/SitesTableTest.php
+++ b/plugins/baser-core/tests/TestCase/Model/Table/SitesTableTest.php
@@ -60,6 +60,32 @@ public function tearDown(): void
         parent::tearDown();
     }
 
+    /**
+     * test validationDefault alias
+     */
+    public function testValidationDefault_alias()
+    {
+        //バリデーションを発生した場合
+        $validator = $this->Sites->getValidator('default');
+        $errors = $validator->validate([
+            'alias' => '漢字'
+        ]);
+        $this->assertEquals('エイリアスは、半角英数・ハイフン（-）・アンダースコア（_）で入力してください。', current($errors['alias']));
+
+        $validator = $this->Sites->getValidator('default');
+        $errors = $validator->validate([
+            'alias' => str_repeat('a', 51)
+        ]);
+        $this->assertEquals('エイリアスは50文字以内で入力してください。', current($errors['alias']));
+
+        //バリデーションを発生しない場合
+        $validator = $this->Sites->getValidator('default');
+        $errors = $validator->validate([
+            'alias' => 'aaaaaaa'
+        ]);
+        $this->assertArrayNotHasKey('alias', $errors);
+    }
+
     /**
      * 公開されている全てのサイトを取得する
      */