diff --git a/ecs/jskult-webapp/src/model/internal/master_mainte_csv.py b/ecs/jskult-webapp/src/model/internal/master_mainte_csv.py
index 39e01583..fa308a26 100644
--- a/ecs/jskult-webapp/src/model/internal/master_mainte_csv.py
+++ b/ecs/jskult-webapp/src/model/internal/master_mainte_csv.py
@@ -101,13 +101,13 @@ class MasterMainteCSVItem(metaclass=ABCMeta):
         try:
             check_date_time: datetime = datetime.strptime(check_date, '%Y%m%d')
         except Exception as e:
-            logger.info(f'適用期間の日付が不正{e}')
+            logger.debug(f'適用期間の日付が不正{e}')
             return (False, None)
 
         try:
             reverse_check_date: str = check_date_time.strftime('%Y%m%d')
         except Exception as e:
-            logger.info(f'適用期間の日付が不正{e}')
+            logger.debug(f'適用期間の日付が不正{e}')
             return (False, None)
 
         if check_date != reverse_check_date: