diff --git a/ecs/jskult-batch-monthly/src/batch/output_arisj_file_process.py b/ecs/jskult-batch-monthly/src/batch/output_arisj_file_process.py
index b8645039..197db381 100644
--- a/ecs/jskult-batch-monthly/src/batch/output_arisj_file_process.py
+++ b/ecs/jskult-batch-monthly/src/batch/output_arisj_file_process.py
@@ -283,12 +283,12 @@ def make_csv_data(record_csv: list):
 
         # Shift-JIS、CRLF、価囲いありで書き込む
         with open(csv_file_path, mode='w', encoding='cp932') as csv_file:
+            # ヘッダ行書き込み
+            csv_file.write(f"{','.join(head_str)}\n")
             writer = csv.writer(csv_file, delimiter=',', lineterminator='\n',
                                 quotechar='"', doublequote=True, quoting=csv.QUOTE_ALL,
                                 strict=True
                                 )
-            # ヘッダ行書き込み
-            writer.writerow(head_str)
             # データ部分書き込み
             for record_data in record_csv:
                 record_value = list(record_data.values())