diff --git a/ISCamRecorder/MainForm.Designer.cs b/ISCamRecorder/MainForm.Designer.cs
index 9fcaf6a..2218ccc 100644
--- a/ISCamRecorder/MainForm.Designer.cs
+++ b/ISCamRecorder/MainForm.Designer.cs
@@ -69,6 +69,8 @@
             this.BtnOpenSubjList = new System.Windows.Forms.Button();
             this.BtnNextSubject = new System.Windows.Forms.Button();
             this.BtnPrevSubject = new System.Windows.Forms.Button();
+            this.TxtCounter = new System.Windows.Forms.TextBox();
+            this.label9 = new System.Windows.Forms.Label();
             ((System.ComponentModel.ISupportInitialize)(this.splitContainer1)).BeginInit();
             this.splitContainer1.Panel1.SuspendLayout();
             this.splitContainer1.Panel2.SuspendLayout();
@@ -410,7 +412,7 @@
             this.TxtRecodingDulation.Name = "TxtRecodingDulation";
             this.TxtRecodingDulation.Size = new System.Drawing.Size(34, 19);
             this.TxtRecodingDulation.TabIndex = 8;
-            this.TxtRecodingDulation.Text = "3";
+            this.TxtRecodingDulation.Text = "30";
             this.TxtRecodingDulation.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
             this.TxtRecodingDulation.TextChanged += new System.EventHandler(this.TxtRecodingDulation_TextChanged);
             this.TxtRecodingDulation.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.NumberKeyOnly);
@@ -585,7 +587,7 @@
             // 
             this.TxtSubjectName.Location = new System.Drawing.Point(836, 34);
             this.TxtSubjectName.Name = "TxtSubjectName";
-            this.TxtSubjectName.Size = new System.Drawing.Size(168, 19);
+            this.TxtSubjectName.Size = new System.Drawing.Size(123, 19);
             this.TxtSubjectName.TabIndex = 24;
             this.TxtSubjectName.Text = "テスト";
             // 
@@ -619,11 +621,32 @@
             this.BtnPrevSubject.UseVisualStyleBackColor = true;
             this.BtnPrevSubject.Click += new System.EventHandler(this.BtnPrevSubject_Click);
             // 
+            // TxtCounter
+            // 
+            this.TxtCounter.Location = new System.Drawing.Point(965, 34);
+            this.TxtCounter.Name = "TxtCounter";
+            this.TxtCounter.Size = new System.Drawing.Size(23, 19);
+            this.TxtCounter.TabIndex = 28;
+            this.TxtCounter.Text = "1";
+            this.TxtCounter.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
+            this.TxtCounter.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.NumberKeyOnly);
+            // 
+            // label9
+            // 
+            this.label9.AutoSize = true;
+            this.label9.Location = new System.Drawing.Point(987, 37);
+            this.label9.Name = "label9";
+            this.label9.Size = new System.Drawing.Size(17, 12);
+            this.label9.TabIndex = 29;
+            this.label9.Text = "回";
+            // 
             // MainForm
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.ClientSize = new System.Drawing.Size(1016, 555);
+            this.Controls.Add(this.label9);
+            this.Controls.Add(this.TxtCounter);
             this.Controls.Add(this.BtnPrevSubject);
             this.Controls.Add(this.BtnNextSubject);
             this.Controls.Add(this.BtnOpenSubjList);
@@ -734,6 +757,8 @@
         private System.Windows.Forms.Button BtnOpenSubjList;
         private System.Windows.Forms.Button BtnNextSubject;
         private System.Windows.Forms.Button BtnPrevSubject;
+        private System.Windows.Forms.TextBox TxtCounter;
+        private System.Windows.Forms.Label label9;
     }
 }
 
diff --git a/ISCamRecorder/MainForm.cs b/ISCamRecorder/MainForm.cs
index ebbd200..d41f3fd 100644
--- a/ISCamRecorder/MainForm.cs
+++ b/ISCamRecorder/MainForm.cs
@@ -58,7 +58,7 @@
         public DateTime RecodingTime { get; private set; } = DateTime.Now; // 録画開始時間
         public string RecodingTimeStr { get { return RecodingTime.ToString("yyyyMMdd_HHmmss"); } }  // 録画開始時間文字列
         public string OutputBaseDir { get { return TxtOutputDir.Text; } } // データ保存親フォルダ
-        public string OutputDir { get { return Path.Combine(OutputBaseDir, $"rec{RecodingTimeStr}_{TxtSubjectName.Text}"); } } // データ保存フォルダ
+        public string OutputDir { get { return Path.Combine(OutputBaseDir, $"rec{RecodingTimeStr}_{TxtSubjectName.Text}_{TxtCounter.Text}"); } } // データ保存フォルダ
         public string ImageType { get; private set; }                   // 画像保存形式
         public int MovieRate { get; private set; }                      // 動画レート
         public bool SwitchEnabled { get; private set; }
@@ -102,6 +102,7 @@
             SwitchEnabled = ChkStartSW.Checked;
 #if DEBUG
             TxtSubjectName.Text = "デバッグ";
+            TxtRecodingDulation.Text = "3";
 #endif
 
             State = STATE.Idle;
@@ -322,6 +323,7 @@
                 BtnRecodeMovie.BackColor = originalButtonColor;
                 BtnRecodeMovie.Enabled = true;
                 BtnSetProperty.Enabled = true;
+                TxtCounter.Text = (int.Parse(TxtCounter.Text) + 1).ToString();
             });
             State = STATE.Idle;
         }
@@ -441,6 +443,7 @@
         /// <param name="e"></param>
         private void BtnNextSubject_Click(object sender, EventArgs e) {
             TxtSubjectName.Text = _SubjectList.Next(TxtSubjectName.Text);
+            TxtCounter.Text = "1";
         }
 
         /// <summary>
@@ -450,6 +453,7 @@
         /// <param name="e"></param>
         private void BtnPrevSubject_Click(object sender, EventArgs e) {
             TxtSubjectName.Text = _SubjectList.Previous(TxtSubjectName.Text);
+            TxtCounter.Text = "1";
         }
     }
 }