diff --git a/src/main/java/istlab/KisoJikken/Launcher.java b/src/main/java/istlab/KisoJikken/Launcher.java
index 5bb3e3a..42865c7 100644
--- a/src/main/java/istlab/KisoJikken/Launcher.java
+++ b/src/main/java/istlab/KisoJikken/Launcher.java
@@ -269,6 +269,8 @@
         if (tp == null)
             return;
         File node = (File) tp.getLastPathComponent();
+        //フォルダなら開かない
+        if (node.isDirectory()) return;
         Editor ed = file2editor.get(node);
         if (ed == null) {
             ed = new Editor(node);