diff --git a/Assets/UniGLTF/Editor/UniGLTF/ExportDialog/SaveFileDialog.cs b/Assets/UniGLTF/Editor/UniGLTF/ExportDialog/SaveFileDialog.cs
index b820a39f2..9ac7cea24 100644
--- a/Assets/UniGLTF/Editor/UniGLTF/ExportDialog/SaveFileDialog.cs
+++ b/Assets/UniGLTF/Editor/UniGLTF/ExportDialog/SaveFileDialog.cs
@@ -35,15 +35,15 @@ namespace UniGLTF
             return path;
         }
 
-        public static string GetDir(string title, string name)
+        public static string GetDir(string title, string dir = null)
         {
-            string directory = m_lastExportDir;
+            string directory = string.IsNullOrEmpty(dir) ? m_lastExportDir : dir;
             if (string.IsNullOrEmpty(directory))
             {
                 directory = Directory.GetParent(Application.dataPath).ToString();
             }
 
-            var path = EditorUtility.SaveFolderPanel(title, directory, name);
+            var path = EditorUtility.SaveFolderPanel(title, directory, null);
             if (!string.IsNullOrEmpty(path))
             {
                 m_lastExportDir = Path.GetDirectoryName(path).Replace("\\", "/");
diff --git a/Assets/VRM10/Editor/Vrm10InstanceEditor.cs b/Assets/VRM10/Editor/Vrm10InstanceEditor.cs
index 376d37145..3beb96798 100644
--- a/Assets/VRM10/Editor/Vrm10InstanceEditor.cs
+++ b/Assets/VRM10/Editor/Vrm10InstanceEditor.cs
@@ -115,6 +115,21 @@ namespace UniVRM10
             return loaded;
         }
 
+        static string GetSaveName(Vrm10Instance instance)
+        {
+            if (instance == null)
+            {
+                return "Assets/vrm-1.0.assets";
+            }
+
+            if (VRMShaders.PathObject.TryGetFromAsset(instance, out var asset))
+            {
+                return (asset.Parent.Child(instance.name + ".asset")).UnityAssetPath;
+            }
+
+            return $"Assets/{instance.name}.assets";
+        }
+
         void SetupVRM10Object(Vrm10Instance instance)
         {
             if (!CheckHumanoid(instance.gameObject))
@@ -124,10 +139,17 @@ namespace UniVRM10
             }
 
             EditorGUILayout.HelpBox("Humanoid OK.", MessageType.Info);
+
+            // VRM10Object
+            var prop = serializedObject.FindProperty(nameof(Vrm10Instance.Vrm));
+            if (prop.objectReferenceValue == null)
+            {
+                EditorGUILayout.HelpBox("No VRM10Object.", MessageType.Error);
+            }
             if (GUILayout.Button("Create new VRM10Object"))
             {
-                var saveName = (instance.name ?? "vrm-1.0");
-                var dir = SaveFileDialog.GetDir(SaveTitle, saveName);
+                var saveName = GetSaveName(instance);
+                var dir = SaveFileDialog.GetDir(SaveTitle, System.IO.Path.GetDirectoryName(saveName));
                 if (!string.IsNullOrEmpty(dir))
                 {
                     var expressions = new Dictionary<ExpressionPreset, VRM10Expression>();
@@ -146,7 +168,6 @@ namespace UniVRM10
                     {
                         // update editor
                         serializedObject.Update();
-                        var prop = serializedObject.FindProperty(nameof(Vrm10Instance.Vrm));
                         prop.objectReferenceValue = asset;
                         serializedObject.ApplyModifiedProperties();
                     }
diff --git a/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs b/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
index d1397552e..6c8afcc26 100644
--- a/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
+++ b/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
@@ -92,6 +92,13 @@ namespace UniVRM10
 
         void Start()
         {
+            if (Vrm == null)
+            {
+                Debug.LogError("no VRM10Object");
+                enabled = false;
+                return;
+            }
+
             // cause new Vrm10Runtime.
             // init LookAt init rotation.
             var runtime = Runtime;
diff --git a/Assets/VRMShaders/GLTF/IO/Runtime/PathObject.cs b/Assets/VRMShaders/GLTF/IO/Runtime/PathObject.cs
index 55cddca2e..4ba004bfa 100644
--- a/Assets/VRMShaders/GLTF/IO/Runtime/PathObject.cs
+++ b/Assets/VRMShaders/GLTF/IO/Runtime/PathObject.cs
@@ -161,14 +161,22 @@ namespace VRMShaders
             }
 
             var assetPath = AssetDatabase.GetAssetPath(src);
-            if (string.IsNullOrEmpty(assetPath))
+            if (!string.IsNullOrEmpty(assetPath))
             {
-                dst = default;
-                return false;
+                dst = FromUnityAssetPath(assetPath);
+                return true;
             }
 
-            dst = FromUnityAssetPath(assetPath);
-            return true;
+            var prefab = PrefabUtility.GetPrefabAssetPathOfNearestInstanceRoot(src);
+            if (!string.IsNullOrEmpty(prefab))
+            {
+                dst = FromUnityAssetPath(prefab);
+                return true;
+            }
+
+            dst = default;
+            return false;
+
         }
 
         public void ImportAsset()