diff --git a/EcomAnalysis/EcomAnalysis.csproj b/EcomAnalysis/EcomAnalysis.csproj
index f9f40f1..8506baa 100644
--- a/EcomAnalysis/EcomAnalysis.csproj
+++ b/EcomAnalysis/EcomAnalysis.csproj
@@ -58,6 +58,7 @@
       <DependentUpon>Form1.cs</DependentUpon>
     </Compile>
     <Compile Include="LogData.cs" />
+    <Compile Include="LogFileInfo.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <EmbeddedResource Include="Form1.resx">
diff --git a/EcomAnalysis/Form1.Designer.cs b/EcomAnalysis/Form1.Designer.cs
index 7c9cb0d..ea89c3f 100644
--- a/EcomAnalysis/Form1.Designer.cs
+++ b/EcomAnalysis/Form1.Designer.cs
@@ -66,6 +66,7 @@
             this.label13 = new System.Windows.Forms.Label();
             this.BtnOpenLog = new System.Windows.Forms.Button();
             this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
+            this.BtnCompareLogs = new System.Windows.Forms.Button();
             this.SuspendLayout();
             // 
             // label1
@@ -467,12 +468,24 @@
             this.openFileDialog1.Filter = "CSVファイル|*.csv";
             this.openFileDialog1.Title = "Logファイルを開く";
             // 
+            // BtnCompareLogs
+            // 
+            this.BtnCompareLogs.Font = new System.Drawing.Font("MS UI Gothic", 15.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(128)));
+            this.BtnCompareLogs.Location = new System.Drawing.Point(259, 621);
+            this.BtnCompareLogs.Name = "BtnCompareLogs";
+            this.BtnCompareLogs.Size = new System.Drawing.Size(220, 38);
+            this.BtnCompareLogs.TabIndex = 27;
+            this.BtnCompareLogs.Text = "過去の実施結果と比較";
+            this.BtnCompareLogs.UseVisualStyleBackColor = true;
+            this.BtnCompareLogs.Click += new System.EventHandler(this.BtnCompareLogs_Click);
+            // 
             // Form1
             // 
             this.AllowDrop = true;
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.ClientSize = new System.Drawing.Size(723, 671);
+            this.Controls.Add(this.BtnCompareLogs);
             this.Controls.Add(this.BtnOpenLog);
             this.Controls.Add(this.label13);
             this.Controls.Add(this.listView2);
@@ -555,6 +568,7 @@
         private System.Windows.Forms.Label label13;
         private System.Windows.Forms.Button BtnOpenLog;
         private System.Windows.Forms.OpenFileDialog openFileDialog1;
+        private System.Windows.Forms.Button BtnCompareLogs;
     }
 }
 
diff --git a/EcomAnalysis/Form1.cs b/EcomAnalysis/Form1.cs
index 5697aac..55edb7a 100644
--- a/EcomAnalysis/Form1.cs
+++ b/EcomAnalysis/Form1.cs
@@ -26,6 +26,7 @@
         private SceneMean _ScMean = new SceneMean();
         private double[] LF = new double[BLOCKS];
         private double[] HF = new double[BLOCKS];
+        private LogFileInfo _LogFileInfo = new LogFileInfo();
 
         /// <summary>
         /// コンストラクタ
@@ -53,13 +54,39 @@
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void Form1_Load(object sender, EventArgs e) {
-            TxtLogFilename.Text = "not opened";
+            ClearData();
             var args = Environment.GetCommandLineArgs();
-            if (args.Length > 1) {
-                ClearData();
-                ReadCSV(args[1]);
-                Analyze();
+            if (args.Length > 1) OpenLog(args[1]);
+        }
+
+        /// <summary>
+        /// ログファイルを開く
+        /// </summary>
+        /// <param name="filename"></param>
+        /// <returns></returns>
+        private bool OpenLog(string filename) {
+            if (!_LogFileInfo.Set(filename)) {
+                MessageBox.Show("Logファイル名が正しくありません", "Error",
+                    MessageBoxButtons.OK, MessageBoxIcon.Error);
+                return false;
             }
+            if (!File.Exists(_LogFileInfo.Filepath)) {
+                MessageBox.Show("ファイルがありません", "Error",
+                    MessageBoxButtons.OK, MessageBoxIcon.Error);
+                return false;
+            }
+
+            ClearData();
+            ReadCSV();
+            Analyze();
+
+            // 表示
+            TxtLogFilename.Text = _LogFileInfo.Filepath;
+            TxtDateTime.Text = _LogFileInfo.ExecDate.ToString("yyyy年MM月dd日 HH時mm分");
+            TxtSubject.Text = _LogFileInfo.Subject;
+            TxtVisit.Text = _LogFileInfo.Visit.ToString();
+
+            return true;
         }
 
         /// <summary>
@@ -70,11 +97,13 @@
             _SceneTable.Clear();
 
             listView1.Items.Clear();
+            listView2.Items.Clear();
             foreach (var ctl in this.Controls) {
                 if (((Control)ctl).GetType().Equals(typeof(TextBox))){
                     ((Control)ctl).Text = "";
                 }
             }
+            TxtLogFilename.Text = "not opened";
         }
 
         /// <summary>
@@ -308,20 +337,13 @@
         /// <summary>
         /// CSVファイルの読み込み
         /// </summary>
-        /// <param name="csvfile"></param>
-        private void ReadCSV(string csvfile) {
+        private void ReadCSV() {
 
-            char[] sep = { ',' };
-            if (!File.Exists(csvfile)) {
-                MessageBox.Show("ファイルがありません", "Error",
-                    MessageBoxButtons.OK, MessageBoxIcon.Error);
-                return;
-            }
-            using (var sr = new StreamReader(csvfile,
+            using (var sr = new StreamReader(_LogFileInfo.Filepath,
                 Encoding.GetEncoding("shift_jis"))) {
 
                 // ヘッダー検証
-                var readHeader = sr.ReadLine().Split(sep);
+                var readHeader = sr.ReadLine().Split(',');
                 var headerCol = new Dictionary<string, int>();
                 foreach (var hi in _HeaderItems) {
                     headerCol.Add(hi, readHeader.ToList().IndexOf(hi));
@@ -336,7 +358,7 @@
                 _Data.Clear();
                 var sceneNoExist = headerCol["sceneNo"] >= 0;
                 while (sr.Peek() > -1) {
-                    var line = sr.ReadLine().Split(sep);
+                    var line = sr.ReadLine().Split(',');
                     var ld = new LogData();
                     ld.ElapTime = double.Parse(line[headerCol["time"]]);
                     ld.StimNo = int.Parse(line[headerCol["stimNo"]]);
@@ -355,18 +377,6 @@
                 }
                 //Debug.WriteLine(_Data.Count);
 
-                // 表示
-                TxtLogFilename.Text = csvfile;
-                var filename = Path.GetFileNameWithoutExtension(csvfile);
-                TxtDateTime.Text = string.Format("{0}年{1}月{2}日 {3}時{4}分",
-                    filename.Substring(0,4), filename.Substring(4, 2),
-                    filename.Substring(6, 2), filename.Substring(9, 2),
-                     filename.Substring(11, 2));
-                var strs = filename.Split('_');
-                var subj = new string[strs.Length - 3];
-                Array.Copy(strs, 2, subj, 0, strs.Length - 3);
-                TxtSubject.Text = $"{string.Join("_", subj)}";
-                TxtVisit.Text = $"{strs[strs.Length - 1]}";
             }
         }
 
@@ -418,9 +428,7 @@
         private void Form1_DragDrop(object sender, DragEventArgs e) {
             var filename = (string[])e.Data.GetData(DataFormats.FileDrop, false);
             if (Path.GetExtension(filename[0]) == ".csv") {
-                ClearData();
-                ReadCSV(filename[0]);
-                Analyze();
+                OpenLog(filename[0]);
             }
         }
 
@@ -431,9 +439,16 @@
         /// <param name="e"></param>
         private void BtnOpenLog_Click(object sender, EventArgs e) {
             if (openFileDialog1.ShowDialog() == DialogResult.Cancel) return;
-            ClearData();
-            ReadCSV(openFileDialog1.FileName);
-            Analyze();
+            OpenLog(openFileDialog1.FileName);
+        }
+
+        /// <summary>
+        /// 過去の実施結果と比較ボタン
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void BtnCompareLogs_Click(object sender, EventArgs e) {
+//            var dir = Path.GetDirectoryName();
         }
     }
 }
diff --git a/EcomAnalysis/LogFileInfo.cs b/EcomAnalysis/LogFileInfo.cs
new file mode 100644
index 0000000..43ef919
--- /dev/null
+++ b/EcomAnalysis/LogFileInfo.cs
@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.IO;
+using System.Globalization;
+
+namespace EcomAnalysis {
+
+    /// <summary>
+    /// ログファイル情報クラス
+    /// ファイル名から得られる情報の管理
+    /// </summary>
+    class LogFileInfo {
+        public string Filepath { get; private set; }
+        public string Filename { get; private set; }
+        public DateTime ExecDate { get; private set; }
+        public int Visit { get; private set; }
+        public string Subject { get; private set; }
+
+        public bool Set(string fn) {
+            Filepath = fn;
+            Filename = Path.GetFileNameWithoutExtension(fn);
+
+            var parseStr = "yyyyMMdd_HHmmss";
+            DateTime dt;
+            if (!DateTime.TryParseExact(Filename.Substring(0, parseStr.Length),
+                parseStr, CultureInfo.InvariantCulture, DateTimeStyles.None, out dt)) return false;
+            ExecDate = dt;
+
+            var strs = Filename.Split('_');
+            if (strs.Length < 4) return false;
+
+            var visitStr = strs[strs.Length - 1];
+            int v;
+            if (!int.TryParse(visitStr, out v)) return false;
+            Visit = v;
+
+            Subject = Filename.Substring(parseStr.Length + 1,
+                Filename.Length - parseStr.Length - visitStr.Length - 2);
+
+            return true;
+        }
+    }
+}