diff --git a/Assets/VRM10/Editor/Components/SpringBone/SpringBoneEditor.cs b/Assets/VRM10/Editor/Components/SpringBone/SpringBoneEditor.cs
index a06fe694f..36765b466 100644
--- a/Assets/VRM10/Editor/Components/SpringBone/SpringBoneEditor.cs
+++ b/Assets/VRM10/Editor/Components/SpringBone/SpringBoneEditor.cs
@@ -27,6 +27,8 @@ namespace UniVRM10
             s_treeView = null;
         }
 
+        public static MonoBehaviour Active;
+
         /// <summary>
         /// 2D の GUI 描画
         /// </summary>
@@ -50,7 +52,7 @@ namespace UniVRM10
             var tree = GetTree(target, so);
             if (tree != null && target != null)
             {
-                tree.Draw3D(target.SpringBone);
+                Active = tree.Draw3D(target.SpringBone);
             }
         }
     }
diff --git a/Assets/VRM10/Editor/Components/SpringBone/SpringBoneTreeView.cs b/Assets/VRM10/Editor/Components/SpringBone/SpringBoneTreeView.cs
index 00072502f..f1de1080d 100644
--- a/Assets/VRM10/Editor/Components/SpringBone/SpringBoneTreeView.cs
+++ b/Assets/VRM10/Editor/Components/SpringBone/SpringBoneTreeView.cs
@@ -116,8 +116,17 @@ namespace UniVRM10
         Color s_selectedColor = new Color(0.5f, 0, 0, 0.5f);
         Color s_Color = new Color(0.6f, 0.6f, 0.6f, 0.5f);
 
-        public void Draw3D(Vrm10InstanceSpringBone springBone)
+        Vrm10InstanceSpringBone last = null;
+        MonoBehaviour Active = null;
+
+        public MonoBehaviour Draw3D(Vrm10InstanceSpringBone springBone)
         {
+            if (springBone != last)
+            {
+                Active = null;
+                last = springBone;
+            }
+
             if (_selected is SelectedColliderGroupGUI colliderGroup)
             {
                 // colliderGroup.Draw3D();                
@@ -127,14 +136,15 @@ namespace UniVRM10
                 // TODO
             }
 
+            MonoBehaviour newActive = null;
             foreach (var group in springBone.ColliderGroups)
             {
                 foreach (var collider in group.Colliders)
                 {
-                    var color = collider.gameObject == Selection.activeObject ? s_selectedColor : s_Color;
+                    var color = collider == Active ? s_selectedColor : s_Color;
                     if (DrawCollider(collider, color))
                     {
-                        Selection.activeObject = collider.gameObject;
+                        newActive = collider;
                     }
                 }
             }
@@ -144,13 +154,44 @@ namespace UniVRM10
                 {
                     var head = spring.Joints[i - 1];
                     var tail = spring.Joints[i];
-                    var color = tail.gameObject == Selection.activeObject ? s_selectedColor : s_Color;
+                    var color = head == Active ? s_selectedColor : s_Color;
                     if (DrawJoint(head, tail, color))
                     {
-                        Selection.activeObject = tail.gameObject;
+                        newActive = head;
                     }
                 }
             }
+
+            if (Active is VRM10SpringBoneCollider activeCollider)
+            {
+                EditorGUI.BeginChangeCheck();
+                Handles.matrix = activeCollider.transform.localToWorldMatrix;
+                var offset = Handles.PositionHandle(activeCollider.Offset, Quaternion.identity);
+                var tail = Vector3.zero;
+                if (activeCollider.ColliderType == VRM10SpringBoneColliderTypes.Capsule)
+                {
+                    tail = Handles.PositionHandle(activeCollider.Tail, Quaternion.identity);
+                }
+                var offsetChanged = EditorGUI.EndChangeCheck();
+                if (offsetChanged)
+                {
+                    // apply
+                    Undo.RecordObject(activeCollider, "activeCollider");
+                    activeCollider.Offset = offset;
+                    if (activeCollider.ColliderType == VRM10SpringBoneColliderTypes.Capsule)
+                    {
+                        activeCollider.Tail = tail;
+                    }
+                }
+            }
+
+            if (newActive != null)
+            {
+                Selection.activeObject = newActive.gameObject;
+                Active = newActive;
+            }
+
+            return Active;
         }
 
         static bool IsLeftDown()
diff --git a/Assets/VRM10/Editor/Components/VRM10Window.cs b/Assets/VRM10/Editor/Components/VRM10Window.cs
index f7aca7c2b..331db7550 100644
--- a/Assets/VRM10/Editor/Components/VRM10Window.cs
+++ b/Assets/VRM10/Editor/Components/VRM10Window.cs
@@ -71,49 +71,14 @@ namespace UniVRM10
 
         Transform m_head;
 
-        // public IVrm10Constraint[] m_constraints;
-
         ScrollView m_scrollView = new ScrollView();
 
-        // enum VRMSceneUI
-        // {
-        //     Constraints,
-        //     SpringBone,
-        // }
-        // static VRMSceneUI s_ui = default;
-        // static string[] s_selection;
-        // static string[] Selection
-        // {
-        //     get
-        //     {
-        //         if (s_selection == null)
-        //         {
-        //             s_selection = Enum.GetNames(typeof(VRMSceneUI));
-        //         }
-        //         return s_selection;
-        //     }
-        // }
-
         /// <summary>
         /// public entry point
         /// </summary>
         /// <param name="target"></param>
         void OnSceneGUI(SceneView sceneView)
         {
-            // switch (s_ui)
-            // {
-            //     case VRMSceneUI.Constraints:
-            //         Tools.hidden = false;
-            //         break;
-
-            //     case VRMSceneUI.SpringBone:
-            //         Tools.hidden = true;
-            //         SpringBoneEditor.Draw3D(Root, m_so);
-            //         break;
-
-            //     default:
-            //         throw new NotImplementedException();
-            // }
             Tools.hidden = true;
             SpringBoneEditor.Draw3D(Root, m_so);
         }
@@ -133,18 +98,17 @@ namespace UniVRM10
                 }
             }
 
+            // Root
             Root = (Vrm10Instance)EditorGUILayout.ObjectField("vrm1", Root, typeof(Vrm10Instance), true);
             if (Root == null)
             {
                 return;
             }
 
-            // var ui = (VRMSceneUI)GUILayout.SelectionGrid((int)s_ui, Selection, 3);
-            // if (s_ui != ui)
-            // {
-            //     s_ui = ui;
-            //     SceneView.RepaintAll();
-            // }
+            // active
+            EditorGUI.BeginDisabledGroup(true);
+            EditorGUILayout.ObjectField("joint or collider", SpringBoneEditor.Active, typeof(MonoBehaviour), true);
+            EditorGUI.EndDisabledGroup();
 
             if (m_so == null)
             {
@@ -156,44 +120,9 @@ namespace UniVRM10
             }
 
             m_so.Update();
-            // switch (s_ui)
-            // {
-            //     case VRMSceneUI.Constraints:
-            //         m_scrollView.Draw(this.position.y, DrawConstraints, Repaint);
-            //         break;
-
-            //     case VRMSceneUI.SpringBone:
-            //         SpringBoneEditor.Draw2D(Root, m_so);
-            //         break;
-
-            //     default:
-            //         throw new NotImplementedException();
-            // }
             SpringBoneEditor.Draw2D(Root, m_so);
 
             m_so.ApplyModifiedProperties();
         }
-
-        // void DrawConstraints()
-        // {
-        //     if (Root != null)
-        //     {
-        //         if (m_constraints == null)
-        //         {
-        //             m_constraints = Root.GetComponentsInChildren<IVrm10Constraint>();
-        //         }
-        //     }
-
-        //     using (new EditorGUI.DisabledScope(true))
-        //     {
-        //         if (m_constraints != null)
-        //         {
-        //             foreach (var c in m_constraints)
-        //             {
-        //                 EditorGUILayout.ObjectField(c.ConstraintTarget, typeof(MonoBehaviour), true);
-        //             }
-        //         }
-        //     }
-        // }
     }
 }