diff --git a/ecs/dataimport/dataimport/chk.py b/ecs/dataimport/dataimport/chk.py
index d3d8801c..125dbb2a 100644
--- a/ecs/dataimport/dataimport/chk.py
+++ b/ecs/dataimport/dataimport/chk.py
@@ -5,8 +5,7 @@ import csv
 import sys
 from end import end
 from error import error
-from common import debug_log
-from common import convert_quotechar
+from common import debug_log, convert_quotechar
 
 # 定数
 DIRECTORY_WORK = '/work/'
@@ -83,12 +82,13 @@ def check(bucket_name, target_data_source, target_file_name, settings_key, log_i
         work_obj = s3_resource.Object(bucket_name, work_key)
         work_response = work_obj.get()
         work_data = io.TextIOWrapper(io.BytesIO(work_response["Body"].read()), encoding=settings_list[SETTINGS_ITEM["charCode"]], newline=LINE_FEED_CODE[settings_list[SETTINGS_ITEM["lineFeedCode"]]])
-        work_header_list = [] 
+        work_header_list = []
+        # ヘッダ行のみのファイルは、0バイトファイル同等とみなす 
         for i, line in enumerate(csv.reader(work_data, quotechar=convert_quotechar(settings_list[SETTINGS_ITEM["quotechar"]]), delimiter=settings_list[SETTINGS_ITEM["delimiter"]])):
             if int(settings_list[SETTINGS_ITEM["headerFlag"]]) == True and i == 0:
                 work_header_list = line
                 continue
-            
+
             break
 
         # ② C-0のデータ件数チェックを開始する
diff --git a/ecs/dataimport/dataimport/common.py b/ecs/dataimport/dataimport/common.py
index 946defe4..1361ff53 100644
--- a/ecs/dataimport/dataimport/common.py
+++ b/ecs/dataimport/dataimport/common.py
@@ -1,6 +1,5 @@
 from datetime import datetime
 
-
 # 定数
 LOG_LEVEL = {"d": 'Debug'}
 MODE_TYPE = {
diff --git a/ecs/dataimport/dataimport/main.py b/ecs/dataimport/dataimport/main.py
index c0894209..23932c6f 100644
--- a/ecs/dataimport/dataimport/main.py
+++ b/ecs/dataimport/dataimport/main.py
@@ -6,8 +6,7 @@ from pymysql.constants import CLIENT
 import io
 import csv
 from error import error
-from common import debug_log
-from common import convert_quotechar
+from common import debug_log, convert_quotechar
 
 # 定数
 DIRECTORY_WORK = '/work/'