diff --git a/src/StartupManagementWindow.java b/src/StartupManagementWindow.java
index 12da34e..be396cc 100644
--- a/src/StartupManagementWindow.java
+++ b/src/StartupManagementWindow.java
@@ -1,10 +1,13 @@
 import javax.swing.*;
+import java.awt.event.*;
 
 public class StartupManagementWindow extends JFrame {
 	private Main main;
 	private JPanel mainPanel;
 	public SwingPresenter presenter;
 
+	private boolean isSaved = false;
+
 	public StartupManagementWindow(Main main) {
 		this.main = main;
 
@@ -12,7 +15,28 @@
 		this.add(mainPanel);
 		presenter = new SwingPresenter(main, mainPanel);
 
-		setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
+		setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
+
+		addWindowListener(new WindowAdapter() {
+			@Override
+			public void windowClosing(WindowEvent e){
+				if(isSaved != true){
+					int result = JOptionPane.showConfirmDialog(
+							StartupManagementWindow.this,
+							"編集中のデータが消えてしまいますが、終了してもよろしいでしょうか？",
+							"終了確認",
+							JOptionPane.YES_NO_OPTION,
+							JOptionPane.WARNING_MESSAGE
+					);
+
+					if(result == JOptionPane.YES_OPTION){
+						dispose();
+					}
+				} else {
+					dispose();
+				}
+			}
+		});
 		setSize(1600, 900);
 		setVisible(true);
 	}
@@ -20,4 +44,8 @@
 	public SwingPresenter getPresenter() {
 		return presenter;
 	}
+
+	public void setSaved(boolean saved){
+		this.isSaved = saved;
+	}
 }