diff --git a/plugins/baser-core/src/Service/UserGroupsService.php b/plugins/baser-core/src/Service/UserGroupsService.php
index b884740278..bb99268b47 100644
--- a/plugins/baser-core/src/Service/UserGroupsService.php
+++ b/plugins/baser-core/src/Service/UserGroupsService.php
@@ -102,7 +102,7 @@ public function getIndex($queryParams = []): Query
             'finder' => 'all',
             'exclude_admin' => false,
             'order' => null,
-            'contain' => ['Users'],
+            'contain' => Configure::read('BcApp.isDisplayUserListInUserGroup') ? ['Users'] : [],
         ], $queryParams);
 
         $query = $this->UserGroups->find($queryParams['finder']);
@@ -180,8 +180,10 @@ public function update(EntityInterface $target, array $postData): ?EntityInterfa
      */
     public function delete(int $id): bool
     {
-        $userGroup = $this->UserGroups->get($id, ['contain' => ['Users']]);
-        if (!empty($userGroup->users)) {
+        $userGroup = $this->UserGroups->get($id);
+        /** @var \Cake\ORM\Association\BelongsToMany $assoc */
+        $assoc = $this->UserGroups->getAssociation('Users');
+        if ($assoc->junction()->exists(['user_group_id' => $id])) {
             throw new BcException(__d('baser_core', 'ユーザーが所属しているユーザーグループは削除できません。'));
         }
         return $this->UserGroups->delete($userGroup);
diff --git a/plugins/baser-core/tests/TestCase/Service/UserGroupsServiceTest.php b/plugins/baser-core/tests/TestCase/Service/UserGroupsServiceTest.php
index 73e118cae5..9474229c6a 100644
--- a/plugins/baser-core/tests/TestCase/Service/UserGroupsServiceTest.php
+++ b/plugins/baser-core/tests/TestCase/Service/UserGroupsServiceTest.php
@@ -18,6 +18,7 @@
 use BaserCore\Test\Scenario\UserGroupsScenario;
 use BaserCore\TestSuite\BcTestCase;
 use CakephpFixtureFactories\Scenario\ScenarioAwareTrait;
+use Cake\Core\Configure;
 
 /**
  * Class UserGroupsServiceTest
@@ -93,6 +94,28 @@ public function testGetIndex()
         $this->assertEquals(3, $userGroups->count());
     }
 
+    /**
+     * Test getIndex with isDisplayUserListInUserGroup false
+     */
+    public function testGetIndex_ContainCheck()
+    {
+        Configure::write('BcApp.isDisplayUserListInUserGroup', true);
+        $userGroups = $this->UserGroups->getIndex();
+        $this->assertEquals(3, $userGroups->count());
+
+        foreach ($userGroups as $userGroup) {
+            $this->assertTrue($userGroup->has('users'));
+        }
+
+        Configure::write('BcApp.isDisplayUserListInUserGroup', false);
+        $userGroups = $this->UserGroups->getIndex();
+        $this->assertEquals(3, $userGroups->count());
+
+        foreach ($userGroups as $userGroup) {
+            $this->assertFalse($userGroup->has('users'));
+        }
+    }
+
     /**
      * Test create
      * @dataProvider createDataProvider