diff --git a/ecs/jskult-batch-daily/src/batch/laundering/mst_inst_laundering.py b/ecs/jskult-batch-daily/src/batch/laundering/mst_inst_laundering.py
index 51a56697..bbaa5fd0 100644
--- a/ecs/jskult-batch-daily/src/batch/laundering/mst_inst_laundering.py
+++ b/ecs/jskult-batch-daily/src/batch/laundering/mst_inst_laundering.py
@@ -129,7 +129,7 @@ def _insert_mst_inst_from_com_inst(db: Database):
             SET SESSION optimizer_switch = 'derived_merge=off'
         """
         db.execute(sql)
-        logger.info("オプティマイザのderived_mergeフラグ = Off")
+        logger.debug("オプティマイザのderived_mergeフラグ = Off")
     except Exception as e:
         logger.debug("オプティマイザのderived_mergeフラグの値変更に失敗")
         raise e