diff --git a/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GlbScriptedImporter.cs b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GlbScriptedImporter.cs
index b733d413c..f14ff3e0b 100644
--- a/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GlbScriptedImporter.cs
+++ b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GlbScriptedImporter.cs
@@ -1,5 +1,3 @@
-using UnityEngine;
-using UnityEditor;
 #if UNITY_2020_2_OR_NEWER
 using UnityEditor.AssetImporters;
 #else
@@ -10,14 +8,11 @@ using UnityEditor.Experimental.AssetImporters;
 namespace UniGLTF
 {
     [ScriptedImporter(1, "glb")]
-    public class GlbScriptedImporter : ScriptedImporter
+    public class GlbScriptedImporter : GltfScriptedImporterBase
     {
-        [SerializeField]
-        public ScriptedImporterAxes m_reverseAxis;
-
         public override void OnImportAsset(AssetImportContext ctx)
         {
-            ScriptedImporterImpl.Import(this, ctx, m_reverseAxis.ToAxes());
+            Import(this, ctx, m_reverseAxis.ToAxes());
         }
     }
 }
diff --git a/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GltfScriptedImporter.cs b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GltfScriptedImporter.cs
index 0ed062141..2ab443cd6 100644
--- a/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GltfScriptedImporter.cs
+++ b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GltfScriptedImporter.cs
@@ -1,5 +1,3 @@
-using UnityEngine;
-using UnityEditor;
 #if UNITY_2020_2_OR_NEWER
 using UnityEditor.AssetImporters;
 #else
@@ -10,14 +8,11 @@ using UnityEditor.Experimental.AssetImporters;
 namespace UniGLTF
 {
     [ScriptedImporter(1, "gltf")]
-    public class GltfScriptedImporter : ScriptedImporter
+    public class GltfScriptedImporter : GltfScriptedImporterBase
     {
-        [SerializeField]
-        public ScriptedImporterAxes m_reverseAxis = default;
-
         public override void OnImportAsset(AssetImportContext ctx)
         {
-            ScriptedImporterImpl.Import(this, ctx, m_reverseAxis.ToAxes());
+            Import(this, ctx, m_reverseAxis.ToAxes());
         }
     }
 }
diff --git a/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/ScriptedImporterImpl.cs b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GltfScriptedImporterBase.cs
similarity index 84%
rename from Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/ScriptedImporterImpl.cs
rename to Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GltfScriptedImporterBase.cs
index 26822ac07..cbb75086e 100644
--- a/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/ScriptedImporterImpl.cs
+++ b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GltfScriptedImporterBase.cs
@@ -1,5 +1,6 @@
-using System.Linq;
 using UnityEngine;
+using UnityEditor;
+using System.Linq;
 using VRMShaders;
 #if UNITY_2020_2_OR_NEWER
 using UnityEditor.AssetImporters;
@@ -10,15 +11,21 @@ using UnityEditor.Experimental.AssetImporters;
 
 namespace UniGLTF
 {
-    public static class ScriptedImporterImpl
+    /// <summary>
+    /// ScriptedImporterImpl から改め
+    /// </summary>
+    public abstract class GltfScriptedImporterBase : ScriptedImporter
     {
+        [SerializeField]
+        public ScriptedImporterAxes m_reverseAxis = default;
+
         /// <summary>
         /// glb をパースして、UnityObject化、さらにAsset化する
         /// </summary>
         /// <param name="scriptedImporter"></param>
         /// <param name="context"></param>
         /// <param name="reverseAxis"></param>
-        public static void Import(ScriptedImporter scriptedImporter, AssetImportContext context, Axes reverseAxis)
+        protected static void Import(ScriptedImporter scriptedImporter, AssetImportContext context, Axes reverseAxis)
         {
 #if VRM_DEVELOP
             Debug.Log("OnImportAsset to " + scriptedImporter.assetPath);
@@ -28,7 +35,7 @@ namespace UniGLTF
             // Parse(parse glb, parser gltf json)
             //
             var data = new AmbiguousGltfFileParser(scriptedImporter.assetPath).Parse();
-            
+
 
             //
             // Import(create unity objects)
diff --git a/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/ScriptedImporterImpl.cs.meta b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GltfScriptedImporterBase.cs.meta
similarity index 83%
rename from Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/ScriptedImporterImpl.cs.meta
rename to Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GltfScriptedImporterBase.cs.meta
index 0581f26f1..b583b8078 100644
--- a/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/ScriptedImporterImpl.cs.meta
+++ b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GltfScriptedImporterBase.cs.meta
@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: 85bf14b48ed135743828ee49a830b1c6
+guid: ae1df0d1926e49f489c74bdf6ca369b5
 MonoImporter:
   externalObjects: {}
   serializedVersion: 2
diff --git a/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/ZipArchivedGltfScriptedImporter.cs b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/ZipArchivedGltfScriptedImporter.cs
index af7819a75..668cbe3a2 100644
--- a/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/ZipArchivedGltfScriptedImporter.cs
+++ b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/ZipArchivedGltfScriptedImporter.cs
@@ -1,5 +1,3 @@
-using UnityEngine;
-using UnityEditor;
 #if UNITY_2020_2_OR_NEWER
 using UnityEditor.AssetImporters;
 #else
@@ -12,14 +10,11 @@ namespace UniGLTF
 #if UNIGLTF_ENABLE_ZIPARCHVIE_IMPORTER
     [ScriptedImporter(1, "zip")]
 #endif
-    public class ZipArchivedGltfScriptedImporter : ScriptedImporter
+    public class ZipArchivedGltfScriptedImporter : GltfScriptedImporterBase
     {
-        [SerializeField]
-        public ScriptedImporterAxes m_reverseAxis = default;
-
         public override void OnImportAsset(AssetImportContext ctx)
         {
-            ScriptedImporterImpl.Import(this, ctx, m_reverseAxis.ToAxes());
+            Import(this, ctx, m_reverseAxis.ToAxes());
         }
     }
 }