diff --git a/ISCamRecorder/ISCamera.cs b/ISCamRecorder/ISCamera.cs
index a3434dd..73ece90 100644
--- a/ISCamRecorder/ISCamera.cs
+++ b/ISCamRecorder/ISCamera.cs
@@ -62,8 +62,7 @@
 
             // 表示設定
             _Cam.LiveDisplayDefault = false;
-            _Cam.LiveDisplayHeight = _Cam.Height;
-            _Cam.LiveDisplayWidth = _Cam.Width;
+            SetDisplaySize();
             //            ic.ImageRingBufferSize = 2;
             _Trigger = _Cam.VCDPropertyItems.Find<VCDButtonProperty>(
                 VCDGUIDs.VCDID_TriggerMode, VCDGUIDs.VCDElement_SoftwareTrigger);
@@ -75,6 +74,28 @@
         }
 
         /// <summary>
+        /// 表示サイズ設定
+        /// </summary>
+        public void SetDisplaySize() {
+            if (!_Cam.DeviceValid) return;
+
+            var vf = _Cam.VideoFormatCurrent;
+            if (vf.Height * _Cam.Width < vf.Width * _Cam.Height) {
+                _Cam.LiveDisplayLeft = 0;
+                _Cam.LiveDisplayWidth = _Cam.Width;
+                var h = vf.Height * _Cam.Width / vf.Width;
+                _Cam.LiveDisplayTop = (_Cam.Height - h) / 2;
+                _Cam.LiveDisplayHeight = h;
+            } else {
+                _Cam.LiveDisplayTop = 0;
+                _Cam.LiveDisplayHeight = _Cam.Width;
+                var w = vf.Width * _Cam.Height / vf.Height;
+                _Cam.LiveDisplayLeft = (_Cam.Width - w) / 2;
+                _Cam.LiveDisplayWidth = w;
+            }
+        }
+
+        /// <summary>
         /// フレーム取得時
         /// </summary>
         /// <param name="buffer"></param>
diff --git a/ISCamRecorder/MainForm.Designer.cs b/ISCamRecorder/MainForm.Designer.cs
index e35aef1..f02d6b1 100644
--- a/ISCamRecorder/MainForm.Designer.cs
+++ b/ISCamRecorder/MainForm.Designer.cs
@@ -132,6 +132,8 @@
             // 
             // TxtTop
             // 
+            this.TxtTop.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
+            | System.Windows.Forms.AnchorStyles.Right)));
             this.TxtTop.Location = new System.Drawing.Point(4, 3);
             this.TxtTop.Name = "TxtTop";
             this.TxtTop.ReadOnly = true;
@@ -173,6 +175,8 @@
             // 
             // TxtLeft
             // 
+            this.TxtLeft.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
+            | System.Windows.Forms.AnchorStyles.Right)));
             this.TxtLeft.Location = new System.Drawing.Point(3, 3);
             this.TxtLeft.Name = "TxtLeft";
             this.TxtLeft.ReadOnly = true;
@@ -215,6 +219,8 @@
             // 
             // TxtFront
             // 
+            this.TxtFront.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
+            | System.Windows.Forms.AnchorStyles.Right)));
             this.TxtFront.Location = new System.Drawing.Point(3, 3);
             this.TxtFront.Name = "TxtFront";
             this.TxtFront.ReadOnly = true;
@@ -238,6 +244,8 @@
             // 
             // TxtRight
             // 
+            this.TxtRight.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
+            | System.Windows.Forms.AnchorStyles.Right)));
             this.TxtRight.Location = new System.Drawing.Point(1, 3);
             this.TxtRight.Name = "TxtRight";
             this.TxtRight.ReadOnly = true;
@@ -271,6 +279,7 @@
             this.Text = "マルチカメラ撮影ソフトウェア by フロンティア医工学センター";
             this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.MainForm_FormClosing);
             this.Load += new System.EventHandler(this.MainForm_Load);
+            this.SizeChanged += new System.EventHandler(this.MainForm_SizeChanged);
             this.splitContainer1.Panel1.ResumeLayout(false);
             this.splitContainer1.Panel2.ResumeLayout(false);
             ((System.ComponentModel.ISupportInitialize)(this.splitContainer1)).EndInit();
diff --git a/ISCamRecorder/MainForm.cs b/ISCamRecorder/MainForm.cs
index 161b628..ea29953 100644
--- a/ISCamRecorder/MainForm.cs
+++ b/ISCamRecorder/MainForm.cs
@@ -104,5 +104,14 @@
         private void ChkTrigger_CheckedChanged(object sender, EventArgs e) {
             _Cameras.ForEach(c => c.SetTriggerMode(((CheckBox)sender).Checked));
         }
+
+        /// <summary>
+        /// サイズ変更時
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void MainForm_SizeChanged(object sender, EventArgs e) {
+            _Cameras.ForEach(c => c.SetDisplaySize());
+        }
     }
 }