diff --git a/lambda/transfer-receive-file-between-s3/transfer-receive-file-between-s3.py b/lambda/transfer-receive-file-between-s3/transfer-receive-file-between-s3.py
index d63cf064..46011138 100644
--- a/lambda/transfer-receive-file-between-s3/transfer-receive-file-between-s3.py
+++ b/lambda/transfer-receive-file-between-s3/transfer-receive-file-between-s3.py
@@ -162,7 +162,7 @@ def lambda_handler(event, context):
 
     except Exception as e:
         logger.exception(
-            f'想定外のエラーが発生しました。処理を終了します。ファイル名フルパス: {event_bucket_name}/{event_object_key}　例外内容：{e}'
+            f'E-99 想定外のエラーが発生しました。処理を終了します。ファイル名フルパス: {event_bucket_name}/{event_object_key}　例外内容：{e}'
         )
         delete_doing_file(event)
         raise e