diff --git a/ecs/crm-datafetch/src/backup_crm_csv_data_process.py b/ecs/crm-datafetch/src/backup_crm_csv_data_process.py
index 11ecb03b..9deb7edf 100644
--- a/ecs/crm-datafetch/src/backup_crm_csv_data_process.py
+++ b/ecs/crm-datafetch/src/backup_crm_csv_data_process.py
@@ -1,18 +1,22 @@
+import os
+import tempfile
+
 from src.aws.s3 import BackupBucket
 from src.config.objects import TargetObject
 from src.error.exceptions import FileUploadException
-from src.system_var.constants import CSVBK_JP_NAME
+from src.system_var.constants import CSVBK_JP_NAME, TEMPORARY_FILENAME
 from src.util.execute_datetime import ExecuteDateTime
 from src.util.logger import logger_instance as logger
+from src.writer.file_writer import CsvWriter
 
 
-def backup_crm_csv_data_process(target_object: TargetObject, execute_datetime: ExecuteDateTime, csv_string: str):
+def backup_crm_csv_data_process(target_object: TargetObject, execute_datetime: ExecuteDateTime, csv_data: list):
     """CSVバックアップ処理
 
     Args:
         target_object (TargetObject): 取得対象オブジェクト情報インスタンス
         execute_datetime (ExecuteDateTime): 実行日時取得インスタンス
-        csv_string (str): csvデータ
+        csv_data (list): csvデータ
 
     Raises:
         FileUploadException: S3のファイルアップロード失敗
@@ -21,27 +25,38 @@ def backup_crm_csv_data_process(target_object: TargetObject, execute_datetime: E
     # ① CSVバックアップ処理の開始ログを出力する
     target_object_name = target_object.object_name
     upload_file_name = target_object.upload_file_name
+    upload_file_key = f'{execute_datetime.to_path()}/{upload_file_name}.csv'
 
     logger.info(
         f'I-CSVBK-01 [{target_object_name}] のCSVデータのバックアップ処理を開始します  ファイル名：[{upload_file_name}.csv]')
-
     try:
         # ② CRMバックアップ保管用バケットに、変換後のCSVデータのバックアップを保管する
-        backup_bucket = BackupBucket()
-        backup_bucket.put_csv(
-            f'{execute_datetime.to_path()}/{upload_file_name}.csv', csv_string)
-
-        logger.debug(
-            f'D-CSVBK-02 [{target_object_name}] のCSVデータバックアップ 正常終了')
-
+        _backup_csv_file(target_object_name, upload_file_key, csv_data)
     except Exception as e:
         raise FileUploadException(
             'E-CSVBK-01',
             CSVBK_JP_NAME, f'[{target_object_name}] CSVデータのバックアップに失敗しました ファイル名：[{upload_file_name}.csv] エラー内容:[{e}]')
-
     # ③ CSVバックアップ処理の終了ログを出力する
     logger.info(
         f'I-CSVBK-03 [{target_object_name}] のCSVデータのバックアップ処理を終了します')
 
     # ④ 次の処理へ移行する
     return
+
+
+def _backup_csv_file(target_object_name: str, upload_file_key: str, csv_data: list) -> None:
+
+    # 一時ファイル書き込み用の領域を確保
+    with tempfile.TemporaryDirectory(prefix=f'{target_object_name}_') as tmpdir:
+        # アップロード用のファイルをローカルに書き出す
+        local_file_path = os.path.join(tmpdir, TEMPORARY_FILENAME)
+        writer = CsvWriter(local_file_path, csv_data)
+        writer.write()
+        # ファイルからS3に書き込み
+        backup_bucket = BackupBucket()
+        backup_bucket.put_csv(upload_file_key, local_file_path)
+
+    logger.debug(
+        f'D-CSVBK-02 [{upload_file_key}] のCSVデータバックアップ 正常終了')
+
+    return
diff --git a/ecs/crm-datafetch/src/system_var/constants.py b/ecs/crm-datafetch/src/system_var/constants.py
index a568fc2f..316b0516 100644
--- a/ecs/crm-datafetch/src/system_var/constants.py
+++ b/ecs/crm-datafetch/src/system_var/constants.py
@@ -83,6 +83,7 @@ CSV_QUOTE_CHAR = '"'
 
 FILE_CHAR_CODE = 'utf-8'
 FILE_MODE_WRITE = 'w'
+TEMPORARY_FILENAME = 'temporary_file'
 
 
 # CRM_取得オブジェクト情報ファイル関連
diff --git a/ecs/crm-datafetch/tests/test_backup_crm_csv_data_process.py b/ecs/crm-datafetch/tests/test_backup_crm_csv_data_process.py
index 267e87da..452f01b8 100644
--- a/ecs/crm-datafetch/tests/test_backup_crm_csv_data_process.py
+++ b/ecs/crm-datafetch/tests/test_backup_crm_csv_data_process.py
@@ -34,12 +34,12 @@ class TestBackupCrmCsvDataProcess:
             - CSVバックアップ処理の仕様に沿った正常系ログが出力されること(デバッグログは除く)
         """
         # Arrange
-        csv_string = textwrap.dedent("""\
-            "Id","AccountNumber","LastModifiedDate","LastModifiedById","SystemModstamp","IsDeleted"
-            "TEST001","test001","2022-06-01 09:00:00","1234567","2022-06-01 09:00:00","1"
-            "TEST002","test002","2022-06-01 09:00:00","1234567","2022-06-01 09:00:00","0"
-            "TEST003","test003","2022-06-01 09:00:00","1234567","2022-06-01 09:00:00","0"
-        """)
+        csv_data = [
+            ["Id", "AccountNumber", "LastModifiedDate", "LastModifiedById", "SystemModstamp", "IsDeleted"],
+            ["TEST001", "test001", "2022-06-01 09:00:00", "1234567", "2022-06-01 09:00:00", 1],
+            ["TEST002", "test002", "2022-06-01 09:00:00", "1234567", "2022-06-01 09:00:00", 0],
+            ["TEST003", "test003", "2022-06-01 09:00:00", "1234567", "2022-06-01 09:00:00", 0]
+        ]
         target_object_dict = {
             'object_name': 'Account',
             'columns': [
@@ -60,16 +60,23 @@ class TestBackupCrmCsvDataProcess:
         monkeypatch.setattr('src.aws.s3.CRM_IMPORT_DATA_BACKUP_FOLDER', 'data_import')
 
         # Act
-        backup_crm_csv_data_process(target_object, execute_datetime, csv_string)
+        backup_crm_csv_data_process(target_object, execute_datetime, csv_data)
 
         # Assert
 
+        expect_csv_value = """\
+            "Id","AccountNumber","LastModifiedDate","LastModifiedById","SystemModstamp","IsDeleted"\r\n\
+            "TEST001","test001","2022-06-01 09:00:00","1234567","2022-06-01 09:00:00","1"\r\n\
+            "TEST002","test002","2022-06-01 09:00:00","1234567","2022-06-01 09:00:00","0"\r\n\
+            "TEST003","test003","2022-06-01 09:00:00","1234567","2022-06-01 09:00:00","0"\r\n\
+        """
+        expect_file_key = f'data_import/{execute_datetime.to_path()}/CRM_Account_{execute_datetime.format_date()}.csv'
         # ファイル確認
         actual = s3_client.get_object(
             Bucket=bucket_name,
-            Key=f'data_import/{execute_datetime.to_path()}/CRM_Account_{execute_datetime.format_date()}.csv')
+            Key=expect_file_key)
 
-        assert actual['Body'].read().decode('utf-8') == csv_string
+        assert actual['Body'].read().decode('utf-8') == textwrap.dedent(expect_csv_value)
 
         # ログの確認
         assert generate_log_message_tuple(
@@ -104,15 +111,20 @@ class TestBackupCrmCsvDataProcess:
         execute_datetime = ExecuteDateTime()
         target_object = TargetObject(target_object_dict, execute_datetime)
 
-        with patch('src.backup_crm_csv_data_process.BackupBucket') as mock_backup_bucket:
+        with patch('src.backup_crm_csv_data_process.BackupBucket') as mock_backup_bucket, \
+                patch('src.backup_crm_csv_data_process.CsvWriter') as mock_writer:
             mock_backup_bucket_inst = mock_backup_bucket.return_value
             mock_backup_bucket_inst.put_csv.return_value = ''
+
+            mock_writer_inst = mock_writer.return_value
+            mock_writer_inst.write.return_value = ''
             # Act
             backup_crm_csv_data_process(target_object, execute_datetime, '')
 
         # Assert
 
         assert mock_backup_bucket_inst.put_csv.called is True
+        assert mock_writer_inst.write.called is True
 
     def test_raise_put_csv(self, bucket_name, monkeypatch, caplog):
         """