diff --git a/ISCamRecorder/SensorData.cs b/ISCamRecorder/SensorData.cs
index ae7d8e1..3c9f141 100644
--- a/ISCamRecorder/SensorData.cs
+++ b/ISCamRecorder/SensorData.cs
@@ -74,6 +74,7 @@
                     if (_RecodingStopSignal) {
                         _CsvWriter.Close();
                         _CsvWriter = null;
+                        _RecodingStopSignal = false;
                     } else {
                         _CsvWriter.WriteLine(
                             $"{dt.ToString("yyyy/MM/dd,HH:mm:ss.fff")},{elapsed:0.00},{val}");
@@ -115,6 +116,10 @@
             return portname;
         }
 
+        /// <summary>
+        /// 記録開始
+        /// </summary>
+        /// <param name="filename"></param>
         public void StartRecoding(string filename) {
             _CsvWriter = new StreamWriter(filename);
             if (_CsvWriter == null) return;
@@ -123,6 +128,9 @@
             _RecodingStopSignal = false;
         }
 
+        /// <summary>
+        /// 記録終了
+        /// </summary>
         public void StopRecoding() {
             _RecodingStopSignal = true;
         }