diff --git a/Assets/VRM10/Editor/Components/SpringBone/VRM10SpringBoneColliderEditor.cs b/Assets/VRM10/Editor/Components/SpringBone/VRM10SpringBoneColliderEditor.cs
index 06bc6ded3..2ad132ac9 100644
--- a/Assets/VRM10/Editor/Components/SpringBone/VRM10SpringBoneColliderEditor.cs
+++ b/Assets/VRM10/Editor/Components/SpringBone/VRM10SpringBoneColliderEditor.cs
@@ -20,11 +20,11 @@ namespace UniVRM10
 
         public override void OnInspectorGUI()
         {
-            if (VRM10Window.Active == target)
-            {
-                GUI.backgroundColor = Color.cyan;
-                Repaint();
-            }
+            // if (VRM10Window.Active == target)
+            // {
+            //     GUI.backgroundColor = Color.cyan;
+            //     Repaint();
+            // }
             var property = serializedObject.FindProperty("m_Script");
             var component = (VRM10SpringBoneCollider)target;
             EditorGUILayout.PropertyField(property, new GUIContent("Script (" + component.GetIdentificationName() + ")"));
diff --git a/Assets/VRM10/Editor/Components/VRM10Window.cs b/Assets/VRM10/Editor/Components/VRM10Window.cs
deleted file mode 100644
index 9256d9fe0..000000000
--- a/Assets/VRM10/Editor/Components/VRM10Window.cs
+++ /dev/null
@@ -1,156 +0,0 @@
-using System;
-using System.Linq;
-using UnityEditor;
-using UnityEngine;
-using UniGLTF;
-
-namespace UniVRM10
-{
-    /// <summary>
-    /// VRM10操作 Window
-    /// </summary>
-    public class VRM10Window : EditorWindow
-    {
-        public const string MENU_NAME = "VRM 1.0 Window";
-
-        public static VRM10Window Open()
-        {
-            var window = (VRM10Window)GetWindow(typeof(VRM10Window));
-            window.titleContent = new GUIContent(MENU_NAME);
-            window.Show();
-            window.Root = UnityEditor.Selection.activeTransform?.GetComponentOrNull<Vrm10Instance>();
-            return window;
-        }
-
-        void OnEnable()
-        {
-            // Debug.Log("OnEnable");
-            Undo.willFlushUndoRecord += Repaint;
-            UnityEditor.Selection.selectionChanged += Repaint;
-
-            SceneView.duringSceneGui += OnSceneGUI;
-        }
-
-        void OnDisable()
-        {
-            s_treeView = null;
-
-            SceneView.duringSceneGui -= OnSceneGUI;
-            // Debug.Log("OnDisable");
-            UnityEditor.Selection.selectionChanged -= Repaint;
-            Undo.willFlushUndoRecord -= Repaint;
-
-            Tools.hidden = false;
-        }
-
-        SerializedObject m_so;
-        int? m_root;
-        Vrm10Instance Root
-        {
-            get => m_root.HasValue ? (EditorUtility.InstanceIDToObject(m_root.Value) as Vrm10Instance) : null;
-            set
-            {
-                int? id = value != null ? value.GetInstanceID() : default;
-                if (m_root == id)
-                {
-                    return;
-                }
-                if (value != null && !value.gameObject.scene.IsValid())
-                {
-                    // skip prefab
-                    return;
-                }
-                m_root = id;
-                m_so = value != null ? new SerializedObject(value) : null;
-            }
-        }
-
-        /// <summary>
-        /// Scene 上の 3D 表示
-        /// 
-        /// * Joint/Collider の Picker
-        /// 
-        /// </summary>
-        void OnSceneGUI(SceneView sceneView)
-        {
-            Tools.hidden = true;
-            Draw3D(Root, m_so);
-        }
-
-        /// <summary>
-        /// Window 上の GUI
-        /// 
-        /// * 対象 VRM の保持
-        /// * 選択 Joint/Collider の表示
-        /// 
-        /// </summary>
-        private void OnGUI()
-        {
-            if (Root == null)
-            {
-                if (UnityEditor.Selection.activeTransform != null)
-                {
-                    var root = UnityEditor.Selection.activeTransform.Ancestors().Select(x => x.GetComponentOrNull<Vrm10Instance>()).FirstOrDefault(x => x != null);
-                    if (root != null)
-                    {
-                        Root = root;
-                    }
-                }
-            }
-
-            // Root
-            Root = (Vrm10Instance)EditorGUILayout.ObjectField("Editing Model", Root, typeof(Vrm10Instance), true);
-            if (Root == null)
-            {
-                return;
-            }
-
-            // active
-            EditorGUI.BeginDisabledGroup(true);
-            EditorGUILayout.ObjectField("Selected Object", Active, typeof(MonoBehaviour), true);
-            EditorGUI.EndDisabledGroup();
-
-            // if (m_so == null)
-            // {
-            //     m_so = new SerializedObject(Root);
-            // }
-            // if (m_so == null)
-            // {
-            //     return;
-            // }
-            // m_so.Update();
-            // SpringBoneEditor.Draw2D(Root, m_so);
-            // m_so.ApplyModifiedProperties();
-        }
-
-        SpringBoneTreeView s_treeView;
-        SpringBoneTreeView GetTree(Vrm10Instance target, SerializedObject so)
-        {
-            if (s_treeView == null || s_treeView.Target != target)
-            {
-                var state = new UnityEditor.IMGUI.Controls.TreeViewState();
-                s_treeView = new SpringBoneTreeView(state, target, so);
-                s_treeView.Reload();
-            }
-            return s_treeView;
-        }
-
-        public static MonoBehaviour Active;
-
-        /// <summary>
-        /// 3D の Handle 描画
-        /// </summary>
-        public void Draw3D(Vrm10Instance target, SerializedObject so)
-        {
-            var tree = GetTree(target, so);
-            if (tree != null && target != null)
-            {
-                if (tree.Draw3D(target.SpringBone))
-                {
-                    Repaint();
-                }
-                Active = tree.Active;
-            }
-        }
-    }
-}
diff --git a/Assets/VRM10/Editor/Components/VRM10Window.cs.meta b/Assets/VRM10/Editor/Components/VRM10Window.cs.meta
deleted file mode 100644
index 1f7d77ff2..000000000
--- a/Assets/VRM10/Editor/Components/VRM10Window.cs.meta
+++ /dev/null
@@ -1,11 +0,0 @@
-fileFormatVersion: 2
-guid: d10db1ad6a9273e4698465a666033569
-MonoImporter:
-  externalObjects: {}
-  serializedVersion: 2
-  defaultReferences: []
-  executionOrder: 0
-  icon: {instanceID: 0}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
diff --git a/Assets/VRM10/Editor/Vrm10InstanceEditor.cs b/Assets/VRM10/Editor/Vrm10InstanceEditor.cs
index fa2c984be..2a75a41e6 100644
--- a/Assets/VRM10/Editor/Vrm10InstanceEditor.cs
+++ b/Assets/VRM10/Editor/Vrm10InstanceEditor.cs
@@ -188,15 +188,6 @@ namespace UniVRM10
                 {
                     SetupVRM10Object(instance);
                 }
-
-                if (instance.Vrm != null)
-                {
-                    EditorGUILayout.HelpBox("SpringBone gizmo etc...", MessageType.Info);
-                    if (GUILayout.Button("Open " + VRM10Window.MENU_NAME))
-                    {
-                        VRM10Window.Open();
-                    }
-                }
             }
 
             base.OnInspectorGUI();
diff --git a/Assets/VRM10/Editor/Vrm10TopMenu.cs b/Assets/VRM10/Editor/Vrm10TopMenu.cs
index 3749c5e63..e0cc2d8eb 100644
--- a/Assets/VRM10/Editor/Vrm10TopMenu.cs
+++ b/Assets/VRM10/Editor/Vrm10TopMenu.cs
@@ -21,9 +21,6 @@ namespace UniVRM10
         private static void ConvertVrmAnimation() => VrmAnimationMenu.BvhToVrmAnimationMenu();
 
 #if VRM_DEVELOP        
-        [MenuItem(ExperimentalMenuPrefix + "/" + VRM10Window.MENU_NAME, false, 23)]
-        private static void OpenWindow() => VRM10Window.Open();
-
         [MenuItem(DevelopmentMenuPrefix + "/Generate from JsonSchema", false, 100)]
         private static void Generate() => Vrm10SerializerGenerator.Run(false);