diff --git a/Assets/VRM10/Editor/Components/Constraint/Coords.cs b/Assets/VRM10/Editor/Components/Constraint/Coords.cs
new file mode 100644
index 000000000..d0f307c92
--- /dev/null
+++ b/Assets/VRM10/Editor/Components/Constraint/Coords.cs
@@ -0,0 +1,32 @@
+using UnityEditor;
+using UnityEngine;
+
+namespace UniVRM10
+{
+    public static class Coords
+    {
+        public static void Write(Matrix4x4 m, float size)
+        {
+            Handles.matrix = m * Matrix4x4.Scale(new Vector3(size, size, size));
+
+            // Handles.CubeHandleCap(0, Vector3.zero, Quaternion.identity, size, EventType.Repaint);
+            Handles.color = Color.red;
+            Handles.DrawLine(Vector3.zero, Vector3.right);
+            Handles.color = Color.green;
+            Handles.DrawLine(Vector3.zero, Vector3.up);
+            Handles.color = Color.blue;
+            Handles.DrawLine(Vector3.zero, Vector3.forward);
+
+            Handles.color = Color.white;
+            // xy
+            Handles.DrawLine(Vector3.right + Vector3.up, Vector3.right);
+            Handles.DrawLine(Vector3.right + Vector3.up, Vector3.up);
+            // yz
+            Handles.DrawLine(Vector3.up + Vector3.forward, Vector3.forward);
+            Handles.DrawLine(Vector3.up + Vector3.forward, Vector3.up);
+            // zx
+            Handles.DrawLine(Vector3.forward + Vector3.right, Vector3.forward);
+            Handles.DrawLine(Vector3.forward + Vector3.right, Vector3.right);
+        }
+    }
+}
diff --git a/Assets/VRM10/Editor/Components/Constraint/Coords.cs.meta b/Assets/VRM10/Editor/Components/Constraint/Coords.cs.meta
new file mode 100644
index 000000000..c41246f85
--- /dev/null
+++ b/Assets/VRM10/Editor/Components/Constraint/Coords.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 069e3004cdd162e488caa0fab3983f05
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/VRM10/Editor/Components/Constraint/VRM10RotationConstraintEditor.cs b/Assets/VRM10/Editor/Components/Constraint/VRM10RotationConstraintEditor.cs
index e89ff2501..a09155b13 100644
--- a/Assets/VRM10/Editor/Components/Constraint/VRM10RotationConstraintEditor.cs
+++ b/Assets/VRM10/Editor/Components/Constraint/VRM10RotationConstraintEditor.cs
@@ -37,31 +37,29 @@ namespace UniVRM10
 
         void DrawSrcLocal()
         {
-            Handles.color = Color.green;
+            var s = m_target.transform.lossyScale.x;
 
             // init 
-            Handles.matrix = m_target.GetSourceLocalInit();
-            Handles.CubeHandleCap(0, Vector3.zero, Quaternion.identity, 0.02f, EventType.Repaint);
+            Coords.Write(m_target.GetSourceLocalInit(), 0.2f / s);
 
             // current
             Handles.matrix = m_target.Source.localToWorldMatrix;
-            var size = 0.04f;
+            Handles.color = Color.yellow;
+            var size = 0.05f / s;
             Handles.DrawWireCube(Vector3.zero, new Vector3(size, size, size));
         }
 
         void DrawDstLocal()
         {
-            Handles.color = Color.red;
+            var s = m_target.transform.lossyScale.x;
 
-            var s = m_target.transform.lossyScale;
-
-            // init 
-            Handles.matrix = m_target.GetDstLocalInit();
-            Handles.CubeHandleCap(0, Vector3.zero, Quaternion.identity, 0.02f / s.x, EventType.Repaint);
+            // init
+            Coords.Write(m_target.GetDstLocalInit(), 0.2f / s);
 
             // current
             Handles.matrix = m_target.transform.localToWorldMatrix;
-            var size = 0.04f / s.x;
+            Handles.color = Color.yellow;
+            var size = 0.05f / s;
             Handles.DrawWireCube(Vector3.zero, new Vector3(size, size, size));
         }