diff --git a/Packages/VRM10/Editor/Components/SpringBone/VRM10SpringBoneJointEditor.cs b/Packages/VRM10/Editor/Components/SpringBone/VRM10SpringBoneJointEditor.cs
index 537ba365c..77ac620e8 100644
--- a/Packages/VRM10/Editor/Components/SpringBone/VRM10SpringBoneJointEditor.cs
+++ b/Packages/VRM10/Editor/Components/SpringBone/VRM10SpringBoneJointEditor.cs
@@ -63,10 +63,11 @@ namespace UniVRM10
             /// spring 情報。readonly。mouse click による hierarchy 参照補助
             /// 
             EditorGUI.BeginDisabledGroup(true);
-            var isLastTail = ShowSpringInfo();
+            var info = Vrm10InstanceSpringBone.GetEditInfo(m_target, m_root);
+            ShowSpringInfo(info);
             EditorGUI.EndDisabledGroup();
 
-            if (isLastTail)
+            if (info.IsLastTail)
             {
                 EditorGUILayout.HelpBox("末端 joint です。下記の設定は使用されません。", MessageType.Info);
             }
@@ -99,7 +100,7 @@ namespace UniVRM10
                 EditorGUILayout.HelpBox("SpringBoneの角度制限はまだdraft仕様です。将来的に仕様が変更される可能性があります。\nThe angle limit feature for SpringBone is still in draft status. The specifications may change in the future.", MessageType.Warning);
 
 
-                if (isLastTail)
+                if (info.IsLastTail)
                 {
                     EditorGUILayout.HelpBox("末端ノードではAngleLimitは無視されます。", MessageType.Info);
                 }
@@ -144,52 +145,51 @@ namespace UniVRM10
         /// - Springに関連付けられたColliderの情報を表示する
         /// </summary>
         /// <returns>末端</returns>
-        bool ShowSpringInfo()
+        static void ShowSpringInfo(Vrm10InstanceSpringBone.EditInfo info)
         {
-            if (m_root == null)
+            if (info.Root == null)
             {
                 EditorGUILayout.HelpBox("no vrm-1.0", MessageType.Warning);
-                return false;
+                return;
             }
-            EditorGUILayout.ObjectField("Vrm-1.0", m_root, typeof(Vrm10Instance), true, null);
+            EditorGUILayout.ObjectField("Vrm-1.0", info.Root, typeof(Vrm10Instance), true, null);
 
-            var found = m_root.SpringBone.FindJoint(m_target);
-            if (!found.HasValue)
+            if (info.Spring == null)
             {
                 EditorGUILayout.HelpBox("This joint not belongs any spring", MessageType.Warning);
-                return false;
+                return;
             }
 
-            var (spring, i, _) = found.Value;
-            m_showJoints = EditorGUILayout.Foldout(m_showJoints, $"Springs[{i}]({spring.Name})");
+            // var (spring, i, _) = found.Value;
+            m_showJoints = EditorGUILayout.Foldout(m_showJoints, $"Springs[{info.SpringIndex}]({info.Spring.Name})");
             int? jointIndex = default;
             // joints
-            for (int j = 0; j < spring.Joints.Count; ++j)
+            for (int j = 0; j < info.Spring.Joints.Count; ++j)
             {
-                var joint = spring.Joints[j];
+                var joint = info.Spring.Joints[j];
                 if (m_showJoints)
                 {
                     var label = $"Joints[{j}]";
-                    if (joint == m_target)
+                    if (joint == info.Target)
                     {
                         label += "★";
                     }
                     EditorGUILayout.ObjectField(label, joint, typeof(VRM10SpringBoneJoint), true, null);
                 }
 
-                if (joint == m_target)
+                if (joint == info.Target)
                 {
                     jointIndex = j;
                 }
             }
 
             m_showColliders = EditorGUILayout.Foldout(m_showColliders, "ColliderGroups");
-            if (m_showColliders && found.HasValue)
+            if (m_showColliders)
             {
                 // collider groups
-                for (int j = 0; j < spring.ColliderGroups.Count; ++j)
+                for (int j = 0; j < info.Spring.ColliderGroups.Count; ++j)
                 {
-                    var group = spring.ColliderGroups[j];
+                    var group = info.Spring.ColliderGroups[j];
                     EditorGUILayout.LabelField($"ColliderGroups[{j}]({group.Name})");
                     for (int k = 0; k < group.Colliders.Count; ++k)
                     {
@@ -199,8 +199,6 @@ namespace UniVRM10
                     }
                 }
             }
-
-            return jointIndex == (spring.Joints.Count - 1);
         }
 
         /// <summary>
diff --git a/Packages/VRM10/Runtime/Components/Vrm10Instance/Vrm10InstanceSpringBone.cs b/Packages/VRM10/Runtime/Components/Vrm10Instance/Vrm10InstanceSpringBone.cs
index f47a972c3..1501e8465 100644
--- a/Packages/VRM10/Runtime/Components/Vrm10Instance/Vrm10InstanceSpringBone.cs
+++ b/Packages/VRM10/Runtime/Components/Vrm10Instance/Vrm10InstanceSpringBone.cs
@@ -89,5 +89,58 @@ namespace UniVRM10
             }
             return default;
         }
+
+        public struct EditInfo
+        {
+            public VRM10SpringBoneJoint Target;
+            public Vrm10Instance Root;
+            public Spring Spring;
+            public int SpringIndex;
+            public int JointIndex;
+            public bool IsLastTail;
+        }
+
+        /// <summary>
+        /// Return SprintBone EditInfo.
+        /// Do not call on runtime play for performance.
+        /// </summary>
+        /// <param name="target">On Editor may null.</param>
+        /// <param name="root">GetComponentInParent cache.</param>
+        /// <returns></returns>
+        public static EditInfo GetEditInfo(VRM10SpringBoneJoint target, Vrm10Instance root)
+        {
+            EditInfo info = default;
+            if (target == null)
+            {
+                return info;
+            }
+            info.Target = target;
+
+            if (root == null)
+            {
+                root = target.GetComponentInParent<Vrm10Instance>();
+            }
+            if (root == null)
+            {
+                return info;
+            }
+            info.Root = root;
+
+            var found = root.SpringBone.FindJoint(target);
+            if (!found.HasValue)
+            {
+                return info;
+            }
+            (info.Spring, info.SpringIndex, info.JointIndex) = found.Value;
+
+
+            // ヒエラルキーの末端ではなく、Springの末端である
+            if (info.Spring.Joints.Count > 0 && info.Spring.Joints[info.Spring.Joints.Count - 1] == target)
+            {
+                info.IsLastTail = true;
+            }
+
+            return info;
+        }
     }
 }