diff --git a/PlateauToolkit.Sandbox/Editor/PlateauSandboxTrackInstantiateInspector.cs b/PlateauToolkit.Sandbox/Editor/PlateauSandboxTrackInstantiateInspector.cs
index 70a08726..a7c3b6f9 100644
--- a/PlateauToolkit.Sandbox/Editor/PlateauSandboxTrackInstantiateInspector.cs
+++ b/PlateauToolkit.Sandbox/Editor/PlateauSandboxTrackInstantiateInspector.cs
@@ -132,10 +132,11 @@ public override void OnInspectorGUI()
                         }
 
                         EditorGUILayout.Space(8);
-                        EditorGUILayout.HelpBox("ここにドラッグアンドドロップしてアイテムを追加", MessageType.Info);
-                        EditorGUILayout.Space(4);
                     }
 
+                    EditorGUILayout.HelpBox("ここにドラッグアンドドロップしてアイテムを追加", MessageType.Info);
+                    EditorGUILayout.Space(4);
+
                     // Apply the removed item.
                     if (removedIndex != -1)
                     {
diff --git a/package.json b/package.json
index 8a0180fa..c23b03b1 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "com.unity.plateautoolkit",
   "displayName": "PLATEAU SDK Toolkits for Unity",
-  "version": "0.3.0-alpha1",
+  "version": "0.3.0",
   "unity": "2021.3",
   "description": "Toolkit utilities for PLATEAU",
   "keywords": [