diff --git a/ecs/dataimport/dataimport/chk.py b/ecs/dataimport/dataimport/chk.py
index 7e050357..987a54b0 100644
--- a/ecs/dataimport/dataimport/chk.py
+++ b/ecs/dataimport/dataimport/chk.py
@@ -4,7 +4,6 @@ import sys
 from datetime import datetime
 
 import boto3
-
 from common import convert_quotechar, debug_log
 from end import end
 from error import error
@@ -41,7 +40,7 @@ LINE_FEED_CODE = {
 }
 
 # クラス変数
-s3_resource = boto3.resource('s3')
+s3_client = boto3.client('s3')
 
 
 # チェック例外クラス
@@ -74,16 +73,14 @@ def check(bucket_name, target_data_source, target_file_name, settings_key, log_i
         print(f'{datetime.now():%Y-%m-%d %H:%M:%S} {log_info} {LOG_LEVEL["i"]} I-CHK-01 - チェック処理を開始します')
 
         # データ読込
-        settings_obj = s3_resource.Object(bucket_name, settings_key)
-        settings_response = settings_obj.get()
+        settings_obj_response = s3_client.get_object(Bucket=bucket_name, Key=settings_key)
         settings_list = []
-        for line in io.TextIOWrapper(io.BytesIO(settings_response["Body"].read()), encoding='utf-8'):
+        for line in io.TextIOWrapper(io.BytesIO(settings_obj_response["Body"].read()), encoding='utf-8'):
             settings_list.append(line.rstrip('\n'))
 
         work_key = target_data_source + DIRECTORY_WORK + target_file_name
-        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_obj_response = s3_client.get_object(Bucket=bucket_name, Key=work_key)
+        work_data = io.TextIOWrapper(io.BytesIO(work_obj_response["Body"].read()), encoding=settings_list[SETTINGS_ITEM["charCode"]], newline=LINE_FEED_CODE[settings_list[SETTINGS_ITEM["lineFeedCode"]]])
         work_csv_row = []
         for i, line in enumerate(csv.reader(work_data, quotechar=convert_quotechar(settings_list[SETTINGS_ITEM["quotechar"]]), delimiter=settings_list[SETTINGS_ITEM["delimiter"]])):
             # ヘッダあり、かつ、1行目の場合