diff --git a/dsbd/utils.py b/dsbd/utils.py
index 8e759dc..921330e 100644
--- a/dsbd/utils.py
+++ b/dsbd/utils.py
@@ -1,5 +1,4 @@
 from django.conf import settings
-from django.urls import reverse
 
 
 def get_admin_url(instance) -> str:
@@ -8,10 +7,9 @@ def get_admin_url(instance) -> str:
     """
     model_name = instance._meta.model_name
     app_label = instance._meta.app_label
-    admin_url = reverse(f"admin:{app_label}_{model_name}_change", args=[instance.pk])
 
     # フルURLにするために現在のサイトドメインを取得
-    full_admin_url = f"{settings.ADMIN_DOMAIN_URL}{admin_url}"
+    full_admin_url = f"{settings.ADMIN_DOMAIN_URL}/admin/{app_label}/{model_name}/{instance.pk}/change/"
 
     return full_admin_url
 
@@ -22,9 +20,8 @@ def get_admin_history_url(instance) -> str:
     """
     model_name = instance._meta.model_name
     app_label = instance._meta.app_label
-    admin_url = reverse(f"admin:{app_label}_{model_name}_history", args=[instance.pk])
 
     # フルURLにするために現在のサイトドメインを取得
-    admin_history_url = f"{settings.ADMIN_DOMAIN_URL}{admin_url}"
+    admin_history_url = f"{settings.ADMIN_DOMAIN_URL}/admin/{app_label}/{model_name}/{instance.pk}/history/"
 
     return admin_history_url