diff --git a/Assets/UniGLTF/Editor/SerializedPropertyEditor.meta b/Assets/UniGLTF/Editor/SerializedPropertyEditor.meta
new file mode 100644
index 000000000..880411af0
--- /dev/null
+++ b/Assets/UniGLTF/Editor/SerializedPropertyEditor.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: ebda22df7de116b4dbc84385b56a69b8
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/UniGLTF/Editor/SerializedPropertyEditor/SerializedPropertyEditor.cs b/Assets/UniGLTF/Editor/SerializedPropertyEditor/SerializedPropertyEditor.cs
new file mode 100644
index 000000000..cc9bdb69c
--- /dev/null
+++ b/Assets/UniGLTF/Editor/SerializedPropertyEditor/SerializedPropertyEditor.cs
@@ -0,0 +1,55 @@
+using System;
+using UnityEditor;
+
+namespace UniGLTF
+{
+    /// <summary>
+    /// ScriptableObject や MonoBehaviour の部分の Editor を表示する。
+    /// </summary>
+    public class SerializedPropertyEditor
+    {
+        protected SerializedObject m_serializedObject;
+        SerializedProperty m_root;
+
+        public SerializedPropertyEditor(SerializedObject serializedObject, SerializedProperty property)
+        {
+            m_serializedObject = serializedObject;
+            m_root = property;
+        }
+
+        public static SerializedPropertyEditor Create(SerializedObject serializedObject, string name)
+        {
+            var prop = serializedObject.FindProperty(name);
+            if (prop == null)
+            {
+                throw new ArgumentNullException();
+            }
+            return new SerializedPropertyEditor(serializedObject, prop);
+        }
+
+        public void OnGUI()
+        {
+            RecursiveProperty(m_root);
+        }
+
+        protected virtual void RecursiveProperty(SerializedProperty root)
+        {
+            var depth = root.depth;
+            var iterator = root.Copy();
+            for (var enterChildren = true; iterator.NextVisible(enterChildren); enterChildren = false)
+            {
+                if (iterator.depth < depth)
+                {
+                    // 前の要素よりも浅くなった。脱出
+                    return;
+                }
+                depth = iterator.depth;
+
+                using (new EditorGUI.DisabledScope("m_Script" == iterator.propertyPath))
+                {
+                    EditorGUILayout.PropertyField(iterator, true);
+                }
+            }
+        }
+    }
+}
diff --git a/Assets/VRM10/Editor/Components/PropGui.cs.meta b/Assets/UniGLTF/Editor/SerializedPropertyEditor/SerializedPropertyEditor.cs.meta
similarity index 83%
rename from Assets/VRM10/Editor/Components/PropGui.cs.meta
rename to Assets/UniGLTF/Editor/SerializedPropertyEditor/SerializedPropertyEditor.cs.meta
index 4fa08752a..b3bf15676 100644
--- a/Assets/VRM10/Editor/Components/PropGui.cs.meta
+++ b/Assets/UniGLTF/Editor/SerializedPropertyEditor/SerializedPropertyEditor.cs.meta
@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: 2a55f4351fdc33f4fadbaa02abc5ffdb
+guid: 094682fd8f99ab7488b000e12d6a45b3
 MonoImporter:
   externalObjects: {}
   serializedVersion: 2
diff --git a/Assets/VRM10/Editor/Components/PropGui.cs b/Assets/VRM10/Editor/Components/PropGui.cs
deleted file mode 100644
index 9d833c711..000000000
--- a/Assets/VRM10/Editor/Components/PropGui.cs
+++ /dev/null
@@ -1,41 +0,0 @@
-using UnityEditor;
-
-namespace UniVRM10
-{
-    /// <summary>
-    /// 指定した SerializedProperty を起点に再帰的に SerializedProperty を表示する。
-    /// </summary>
-    class PropGui
-    {
-        SerializedProperty m_root;
-
-        public PropGui(SerializedProperty property)
-        {
-            m_root = property;
-        }
-
-        // public static PropGui FromSerializedObject(SerializedObject serializedObject, string name)
-        // {
-        //     var prop = serializedObject.FindProperty(name);
-        //     return new PropGui(prop);
-        // }
-
-        public void RecursiveProperty()
-        {
-            var depth = m_root.depth;
-            var iterator = m_root.Copy();
-            for (var enterChildren = true; iterator.NextVisible(enterChildren); enterChildren = false)
-            {
-                if (iterator.depth < depth)
-                    return;
-
-                depth = iterator.depth;
-
-                using (new EditorGUI.DisabledScope("m_Script" == iterator.propertyPath))
-                {
-                    EditorGUILayout.PropertyField(iterator, true);
-                }
-            }
-        }
-    }
-}
diff --git a/Assets/VRM10/Editor/Components/VRM10ObjectEditor.cs b/Assets/VRM10/Editor/Components/VRM10ObjectEditor.cs
index 4c9a19464..d6ba4f3a7 100644
--- a/Assets/VRM10/Editor/Components/VRM10ObjectEditor.cs
+++ b/Assets/VRM10/Editor/Components/VRM10ObjectEditor.cs
@@ -21,11 +21,11 @@ namespace UniVRM10
         static Tabs _tab = Tabs.Meta;
 
         // for SerializedProperty
-        PropGui m_expression;
-        PropGui m_meta;
-        PropGui m_lookAt;
-        PropGui m_firstPerson;
-        PropGui m_asset;
+        SerializedPropertyEditor m_expression;
+        SerializedPropertyEditor m_meta;
+        SerializedPropertyEditor m_lookAt;
+        SerializedPropertyEditor m_firstPerson;
+        SerializedPropertyEditor m_asset;
 
         void OnEnable()
         {
@@ -35,10 +35,10 @@ namespace UniVRM10
             }
             m_target = (VRM10Object)target;
 
-            m_expression = new PropGui(serializedObject.FindProperty(nameof(m_target.Expression)));
-            m_meta = new PropGui(serializedObject.FindProperty(nameof(m_target.Meta)));
-            m_lookAt = new PropGui(serializedObject.FindProperty(nameof(m_target.LookAt)));
-            m_firstPerson = new PropGui(serializedObject.FindProperty(nameof(m_target.FirstPerson)));
+            m_expression = SerializedPropertyEditor.Create(serializedObject, nameof(m_target.Expression));
+            m_meta = SerializedPropertyEditor.Create(serializedObject, nameof(m_target.Meta));
+            m_lookAt = SerializedPropertyEditor.Create(serializedObject, nameof(m_target.LookAt));
+            m_firstPerson = SerializedPropertyEditor.Create(serializedObject, nameof(m_target.FirstPerson));
         }
 
         public override void OnInspectorGUI()
@@ -54,19 +54,19 @@ namespace UniVRM10
             switch (_tab)
             {
                 case Tabs.Meta:
-                    m_meta.RecursiveProperty();
+                    m_meta.OnGUI();
                     break;
 
                 case Tabs.Expression:
-                    m_expression.RecursiveProperty();
+                    m_expression.OnGUI();
                     break;
 
                 case Tabs.LookAt:
-                    m_lookAt.RecursiveProperty();
+                    m_lookAt.OnGUI();
                     break;
 
                 case Tabs.FirstPerson:
-                    m_firstPerson.RecursiveProperty();
+                    m_firstPerson.OnGUI();
                     break;
             }
             serializedObject.ApplyModifiedProperties();