diff --git a/ISCamRecorder/MainForm.cs b/ISCamRecorder/MainForm.cs
index dcf46f8..4e0c463 100644
--- a/ISCamRecorder/MainForm.cs
+++ b/ISCamRecorder/MainForm.cs
@@ -242,6 +242,8 @@
                     "rec" + DateTime.Now.ToString("yyyyMMdd_HHmmss"));
                 Directory.CreateDirectory(outputDir);
                 var imageType = CboImageType.Text;
+                var sensorFile = Path.Combine(outputDir, @"sensor.csv");
+                _Sensor.StartRecoding(sensorFile);
                 // 録画
                 //DateTime recordStartTime = DateTime.Now;
                 Task[] tasks = new Task[4];
@@ -250,6 +252,7 @@
                     tasks[i] = Task.Run(() => cam.RecordToMemory(framesToCapture));
                 }
                 Task.WaitAll(tasks);
+                _Sensor.StopRecoding();
                 // 保存
                 BtnRecodeMovie.Text = "保存中";
                 BtnRecodeMovie.BackColor = Color.Aqua;
diff --git a/ISCamRecorder/SensorData.cs b/ISCamRecorder/SensorData.cs
index 8bd032f..ae7d8e1 100644
--- a/ISCamRecorder/SensorData.cs
+++ b/ISCamRecorder/SensorData.cs
@@ -6,6 +6,7 @@
 using System.IO.Ports;
 using System.Management;
 using System.Diagnostics;
+using System.IO;
 
 namespace ISCamRecorder {
     internal class SensorData {
@@ -20,7 +21,9 @@
         bool _ExitSignal = false;       // 終了シグナル
         int _QueueLength = 1;           // グラフ表示するサンプル数
         public static object Locker = new object(); // 受信データの排他制御
-        bool _Recoding = false;         // 記録中フラグ
+        bool _RecodingStopSignal = false;      // 記録終了シグナル
+        StreamWriter _CsvWriter = null;        // ファイル保存オブジェクト
+        DateTime _RecordBeginTime;
 
         /// <summary>
         /// 接続
@@ -66,6 +69,16 @@
                 var str = _Serial.ReadLine();
                 var val = int.Parse(str);
                 var dt = DateTime.Now;
+                var elapsed = (dt - _RecordBeginTime).TotalMilliseconds;
+                if (_CsvWriter != null) {
+                    if (_RecodingStopSignal) {
+                        _CsvWriter.Close();
+                        _CsvWriter = null;
+                    } else {
+                        _CsvWriter.WriteLine(
+                            $"{dt.ToString("yyyy/MM/dd,HH:mm:ss.fff")},{elapsed:0.00},{val}");
+                    }
+                }
                 lock (Locker) {
                     Values.Enqueue(val);
                     Times.Enqueue(dt);
@@ -102,8 +115,16 @@
             return portname;
         }
 
-        public void StartRecoding() {
+        public void StartRecoding(string filename) {
+            _CsvWriter = new StreamWriter(filename);
+            if (_CsvWriter == null) return;
+            _CsvWriter.WriteLine($"Date,Time,elapsed,sensor");
+            _RecordBeginTime = DateTime.Now;
+            _RecodingStopSignal = false;
+        }
 
+        public void StopRecoding() {
+            _RecodingStopSignal = true;
         }
     }
 }