diff --git a/Scripts/Editor/Tests/MeshTests.cs b/Scripts/Editor/Tests/MeshTests.cs
new file mode 100644
index 000000000..e496753c6
--- /dev/null
+++ b/Scripts/Editor/Tests/MeshTests.cs
@@ -0,0 +1,64 @@
+using NUnit.Framework;
+using UnityEngine;
+using System.Linq;
+
+
+namespace VRM
+{
+    public class MeshTests
+    {
+        public static void MeshEquals(Mesh l, Mesh r)
+        {
+#if UNITY_2017_3_OR_NEWER
+            Assert.AreEqual(l.indexFormat, r.indexFormat);
+#endif
+            Assert.True(l.vertices.SequenceEqual(r.vertices));
+            Assert.True(l.normals.SequenceEqual(r.normals));
+            Assert.True(l.tangents.SequenceEqual(r.tangents));
+            Assert.True(l.uv.SequenceEqual(r.uv));
+            Assert.True(l.uv2.SequenceEqual(r.uv2));
+            Assert.True(l.uv3.SequenceEqual(r.uv3));
+            Assert.True(l.uv4.SequenceEqual(r.uv4));
+            Assert.True(l.colors.SequenceEqual(r.colors));
+            Assert.True(l.boneWeights.SequenceEqual(r.boneWeights));
+            Assert.True(l.bindposes.SequenceEqual(r.bindposes));
+
+            Assert.AreEqual(l.subMeshCount, r.subMeshCount);
+            for (int i = 0; i < l.subMeshCount; ++i)
+            {
+                Assert.True(l.GetIndices(i).SequenceEqual(r.GetIndices(i)));
+            }
+
+            Assert.AreEqual(l.blendShapeCount, r.blendShapeCount);
+            for (int i = 0; i < l.blendShapeCount; ++i)
+            {
+                Assert.AreEqual(l.GetBlendShapeName(i), r.GetBlendShapeName(i));
+                Assert.AreEqual(l.GetBlendShapeFrameCount(i), r.GetBlendShapeFrameCount(i));
+                Assert.AreEqual(l.GetBlendShapeFrameWeight(i, 0), r.GetBlendShapeFrameWeight(i, 0));
+
+                var lv = l.vertices;
+                var ln = l.vertices;
+                var lt = l.vertices;
+                var rv = r.vertices;
+                var rn = r.vertices;
+                var rt = r.vertices;
+                l.GetBlendShapeFrameVertices(i, 0, lv, ln, lt);
+                r.GetBlendShapeFrameVertices(i, 0, rv, rn, rt);
+                Assert.True(lv.SequenceEqual(rv));
+                Assert.True(ln.SequenceEqual(rn));
+                Assert.True(lt.SequenceEqual(rt));
+            }
+        }
+
+        [Test]
+        public void MeshCopyTest()
+        {
+            var src = new Mesh();
+            src.AddBlendShapeFrame("blendShape", 100.0f, null, null, null);
+
+            var dst = src.Copy(true);
+
+            MeshEquals(src, dst);
+        }
+    }
+}
diff --git a/Scripts/Editor/Tests/MeshTests.cs.meta b/Scripts/Editor/Tests/MeshTests.cs.meta
new file mode 100644
index 000000000..2b91dd684
--- /dev/null
+++ b/Scripts/Editor/Tests/MeshTests.cs.meta
@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: 0fa06e6e83b995a49a1357924b9ef23e
+timeCreated: 1533274120
+licenseType: Free
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Scripts/SkinnedMeshUtility/BoneNormalizer.cs b/Scripts/SkinnedMeshUtility/BoneNormalizer.cs
index e5c77acdb..3b953c08d 100644
--- a/Scripts/SkinnedMeshUtility/BoneNormalizer.cs
+++ b/Scripts/SkinnedMeshUtility/BoneNormalizer.cs
@@ -153,7 +153,7 @@ namespace VRM
                 // Before bake, bind no weight bones
                 //Debug.LogFormat("no weight: {0}", srcMesh.name);
 
-                srcMesh = srcMesh.Copy();
+                srcMesh = srcMesh.Copy(true);
                 var bw = new BoneWeight
                 {
                     boneIndex0 = 0,
@@ -175,7 +175,7 @@ namespace VRM
             }
 
             // BakeMesh
-            var mesh = srcMesh.Copy();
+            var mesh = srcMesh.Copy(false);
             mesh.name = srcMesh.name + ".baked";
             srcRenderer.BakeMesh(mesh);
             mesh.boneWeights = srcMesh.boneWeights; // restore weights. clear when BakeMesh
@@ -328,7 +328,7 @@ namespace VRM
             // Meshに乗っているボーンの姿勢を適用する
             var dstFilter = dst.gameObject.AddComponent<MeshFilter>();
 
-            var dstMesh = srcFilter.sharedMesh.Copy();
+            var dstMesh = srcFilter.sharedMesh.Copy(false);
             dstMesh.ApplyRotationAndScale(src.localToWorldMatrix);
             dstFilter.sharedMesh = dstMesh;
 
diff --git a/Scripts/SkinnedMeshUtility/MeshExtensions.cs b/Scripts/SkinnedMeshUtility/MeshExtensions.cs
index df28c98ee..bf4a24cfe 100644
--- a/Scripts/SkinnedMeshUtility/MeshExtensions.cs
+++ b/Scripts/SkinnedMeshUtility/MeshExtensions.cs
@@ -6,7 +6,7 @@ namespace VRM
 {
     public static class MeshExtensions
     {
-        public static Mesh Copy(this Mesh src)
+        public static Mesh Copy(this Mesh src, bool copyBlendShape)
         {
             var dst = new Mesh();
             dst.name = src.name + "(copy)";
@@ -33,6 +33,24 @@ namespace VRM
 
             dst.RecalculateBounds();
 
+            if (copyBlendShape)
+            {
+                var vertices = src.vertices;
+                var normals = src.normals;
+                var tangents = src.tangents.Select(x => (Vector3)x).ToArray();
+                for (int i = 0; i < src.blendShapeCount; ++i)
+                {
+                    src.GetBlendShapeFrameVertices(i, 0, vertices, normals, tangents);
+                    dst.AddBlendShapeFrame(
+                        src.GetBlendShapeName(i),
+                        src.GetBlendShapeFrameWeight(i, 0),
+                        vertices,
+                        normals,
+                        tangents
+                        );
+                }
+            }
+
             return dst;
         }