diff --git a/ISCamRecorder/Setting.Designer.cs b/ISCamRecorder/Setting.Designer.cs
index dde10d4..a8978f7 100644
--- a/ISCamRecorder/Setting.Designer.cs
+++ b/ISCamRecorder/Setting.Designer.cs
@@ -659,7 +659,7 @@
             this.ShowInTaskbar = false;
             this.StartPosition = System.Windows.Forms.FormStartPosition.CenterParent;
             this.Text = "ISCamRecoder設定";
-            this.Activated += new System.EventHandler(this.Setting_Activated);
+            this.Shown += new System.EventHandler(this.Setting_Shown);
             this.groupBox1.ResumeLayout(false);
             this.groupBox1.PerformLayout();
             this.panel1.ResumeLayout(false);
diff --git a/ISCamRecorder/Setting.cs b/ISCamRecorder/Setting.cs
index a589e7b..464cccd 100644
--- a/ISCamRecorder/Setting.cs
+++ b/ISCamRecorder/Setting.cs
@@ -8,6 +8,7 @@
 using System.Threading.Tasks;
 using System.Windows.Forms;
 using System.IO;
+using System.Diagnostics;
 
 namespace ISCamRecorder {
     public partial class Setting : Form {
@@ -73,7 +74,7 @@
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
-        private void Setting_Activated(object sender, EventArgs e) {
+        private void Setting_Shown(object sender, EventArgs e) {
             TxtOutputDir.Text = SaveDir;
             CboImageType.SelectedItem = ImageType.ToUpper();
             CboFrameType.SelectedItem = FrameType.ToUpper();
@@ -107,6 +108,14 @@
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void BtnApply_Click(object sender, EventArgs e) {
+            // 検証
+            var reccams = new bool[] { ChkRecTop.Checked, ChkRecLeft.Checked, ChkRecFront.Checked, ChkRecRight.Checked };
+            if (reccams.All(s => !s)) {
+                MessageBox.Show("録画カメラは上・左・前・右から最低１つ選択してください");
+                return;
+            }
+
+            // 保存
             SaveDir = TxtOutputDir.Text;
             ImageType = CboImageType.Text.ToLower();
             FrameType = CboFrameType.Text.ToLower();