diff --git a/ecs/jskult-webapp/src/controller/master_mainte.py b/ecs/jskult-webapp/src/controller/master_mainte.py
index 1538e02a..f3fbd220 100644
--- a/ecs/jskult-webapp/src/controller/master_mainte.py
+++ b/ecs/jskult-webapp/src/controller/master_mainte.py
@@ -136,12 +136,22 @@ async def inst_emp_csv_upload(
         raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail=constants.LOGOUT_REASON_BACKUP_PROCESSING)
 
     # 画面表示用のモデル
-    csv_buf = await csv_upload_form.csv_file.read()
-    mainte_csv_up = master_mainte_service.prepare_mainte_csv_up_view(
-        TextIOWrapper(BytesIO(csv_buf), encoding='utf-8'),
-        len(csv_buf),
-        csv_upload_form.csv_file.filename,
-        csv_upload_form)
+    csv_upload_form.csv_file.file.seek(0, 2)
+    if csv_upload_form.csv_file.file.tell() >= constants.MENTE_CSV_UPLOAD_MAX_FILE_SIZE_BYTE:
+        error_message_list = []
+        error_message_list.append('選択されたCSVファイルサイズが大きいです。100MB未満にしてください。')
+        mainte_csv_up = InstEmpCsvUploadViewModel(
+            is_verified=True,
+            error_message_list=error_message_list,
+            select_function=csv_upload_form.select_function,
+            select_table=csv_upload_form.select_table
+        )
+    else:
+        csv_upload_form.csv_file.file.seek(0)
+        mainte_csv_up = master_mainte_service.prepare_mainte_csv_up_view(
+            TextIOWrapper(BytesIO(await csv_upload_form.csv_file.read()), encoding='utf-8'),
+            csv_upload_form.csv_file.filename,
+            csv_upload_form)
     # セッション書き換え
     session.update(
         actions=[
diff --git a/ecs/jskult-webapp/src/repositories/emp_chg_inst_repository.py b/ecs/jskult-webapp/src/repositories/emp_chg_inst_repository.py
index 04e8b0d7..ec6e5df3 100644
--- a/ecs/jskult-webapp/src/repositories/emp_chg_inst_repository.py
+++ b/ecs/jskult-webapp/src/repositories/emp_chg_inst_repository.py
@@ -188,13 +188,11 @@ class EmpChgInstRepository(BaseRepository):
     def fetch_as_data_frame(self, table_name: str, parameter: MasterMainteCsvDlModel):
         try:
             self._database.connect()
-            logger.debug('DB参照実行')
             where_clause = self.__build_condition(parameter)
             query = self.FETCH_SQL.format(table_name=table_name, where_clause=where_clause)
             logger.debug(f'SQL: {query}')
             df = self._to_data_frame(query, parameter)
             logger.debug(f'count= {len(df.index)}')
-            # ログ出力のため、クエリも返却
             return df
         except Exception as e:
             logger.exception(f"DB Error : Exception={e.args}")
diff --git a/ecs/jskult-webapp/src/services/master_mainte_service.py b/ecs/jskult-webapp/src/services/master_mainte_service.py
index b63ad123..863ddfae 100644
--- a/ecs/jskult-webapp/src/services/master_mainte_service.py
+++ b/ecs/jskult-webapp/src/services/master_mainte_service.py
@@ -59,7 +59,6 @@ class MasterMainteService(BaseService):
 
     def prepare_mainte_csv_up_view(self,
                                    file: TextIOWrapper,
-                                   file_size: int,
                                    csv_file_name: str,
                                    csv_upload_form: MasterMainteCsvUpModel) -> InstEmpCsvUploadViewModel:
 
@@ -84,8 +83,6 @@ class MasterMainteService(BaseService):
         # CSVファイル0件(ヘッダ行のみ)チェック
         if len(csv_items.lines) == 0:
             error_message_list.append('選択されたExcelファイルの2行目以降に値が記入されておりません。')
-        elif file_size >= constants.MENTE_CSV_UPLOAD_MAX_FILE_SIZE:
-            error_message_list.append('選択されたCSVファイルサイズが大きいです。100MB未満にしてください。')
         else:
             for row_item in csv_items:
                 error_message_list.extend([data for data in row_item.validate()])
@@ -136,7 +133,7 @@ class MasterMainteService(BaseService):
         (result_message_list, raw_error_list) = emp_chg_inst.save()
 
         error_message_list = []
-        error_message_list.extend([data for data in raw_error_list])
+        error_message_list.extend(raw_error_list)
 
         mainte_csv_up = InstEmpCsvUploadViewModel(
             is_insert=True,
diff --git a/ecs/jskult-webapp/src/system_var/constants.py b/ecs/jskult-webapp/src/system_var/constants.py
index e220249c..a50d498e 100644
--- a/ecs/jskult-webapp/src/system_var/constants.py
+++ b/ecs/jskult-webapp/src/system_var/constants.py
@@ -250,4 +250,5 @@ MENTE_CSV_DOWNLOAD_HEADER = [
 
 MENTE_CSV_DOWNLOAD_FILE_NAME = 'instEmpData.csv'
 
-MENTE_CSV_UPLOAD_MAX_FILE_SIZE = 104857600
+# CSVアップロードの制限サイズ＝100MB
+MENTE_CSV_UPLOAD_MAX_FILE_SIZE_BYTE = 104857600
diff --git a/ecs/jskult-webapp/src/templates/instEmpCsvDL.html b/ecs/jskult-webapp/src/templates/instEmpCsvDL.html
index 78bc147e..3a370f37 100644
--- a/ecs/jskult-webapp/src/templates/instEmpCsvDL.html
+++ b/ecs/jskult-webapp/src/templates/instEmpCsvDL.html
@@ -8,13 +8,12 @@
     <link href="/static/css/masterMainte.css" rel="stylesheet" />
 
     <script type="text/javascript">
-        controlCount = 12; // 検索フォームの入力ボックスの数
         window.onload = function(){
             // ボタン、テキストボックス初期化
             formBtDisabled();
             // DatePickerを有効化
             enableDatePicker();
-{% if mainte_csv_dl.is_search and mainte_csv_dl.data_count > 0 and mainte_csv_dl.is_download_file_url_empty() == False %}
+{% if mainte_csv_dl.is_search and mainte_csv_dl.data_count > 0 and mainte_csv_dl.is_download_file_url_empty() is False %}
             // CSV自動ダウンロード処理
             var link_tag = document.createElement("a"); 
             link_tag.Target="_blank";