diff --git a/CSVDownloader/Web/WebController.cs b/CSVDownloader/Web/WebController.cs
index 1741ee0..d729f05 100644
--- a/CSVDownloader/Web/WebController.cs
+++ b/CSVDownloader/Web/WebController.cs
@@ -156,7 +156,12 @@ namespace CSVDownloader.Web {
                 if (files.Length != 0) {
                     var file = files[0];
 
-                    if (file.Length == last_size) {
+
+                    if (file.Name.Contains(".crdownload")) {
+                        // ダウンロード継続
+                        last_size = file.Length;
+                        logger_.Info($"ダウンロード監視中:{file.Name}  size:{file.Length}");
+                    } else if (file.Length == last_size) {
                         // ダウンロード完了
                         logger_.Info($"ダウンロード完了:{file.Name}  size:{file.Length}");
                         complete_filename = file.Name;