diff --git a/Assets/VRM/UniVRM/Editor/BlendShape/VRMBlendShapeProxyValidator.cs b/Assets/VRM/UniVRM/Editor/BlendShape/VRMBlendShapeProxyValidator.cs
new file mode 100644
index 000000000..37eace657
--- /dev/null
+++ b/Assets/VRM/UniVRM/Editor/BlendShape/VRMBlendShapeProxyValidator.cs
@@ -0,0 +1,73 @@
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace VRM
+{
+    public static class VRMBlendShapeProxyValidator
+    {
+        public static IEnumerable<Validation> Validate(this VRMBlendShapeProxy p)
+        {
+            if (p == null)
+            {
+                yield return Validation.Error("VRMBlendShapeProxy is null");
+                yield break;
+            }
+
+            if (p.BlendShapeAvatar == null)
+            {
+                yield return Validation.Error("BlendShapeAvatar is null");
+                yield break;
+            }
+
+            // presetがユニークか
+            var used = new HashSet<BlendShapeKey>();
+            foreach (var c in p.BlendShapeAvatar.Clips)
+            {
+                var key = c.Key;
+                if (used.Contains(key))
+                {
+                    yield return Validation.Error($"duplicated BlendShapeKey: {c}");
+                }
+                else
+                {
+                    used.Add(key);
+                }
+            }
+
+            var materialNames = new HashSet<string>();
+            foreach (var r in p.GetComponentsInChildren<Renderer>(true))
+            {
+                foreach (var m in r.sharedMaterials)
+                {
+                    if (!materialNames.Contains(m.name))
+                    {
+                        materialNames.Add(m.name);
+                    }
+                }
+            }
+
+            // 参照が生きているか
+            foreach (var c in p.BlendShapeAvatar.Clips)
+            {
+                for (int i = 0; i < c.Values.Length; ++i)
+                {
+                    var v = c.Values[i];
+                    var target = p.transform.Find(v.RelativePath);
+                    if (target == null)
+                    {
+                        yield return Validation.Error($"{c}.Values[{i}].RelativePath({v.RelativePath} is not found");
+                    }
+                }
+
+                for (int i = 0; i < c.MaterialValues.Length; ++i)
+                {
+                    var v = c.MaterialValues[i];
+                    if (!materialNames.Contains(v.MaterialName))
+                    {
+                        yield return Validation.Error($"{c}.MaterialValues[{i}].MaterialName({v.MaterialName} is not found");
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/Assets/VRM/UniVRM/Editor/BlendShape/VRMBlendShapeProxyValidator.cs.meta b/Assets/VRM/UniVRM/Editor/BlendShape/VRMBlendShapeProxyValidator.cs.meta
new file mode 100644
index 000000000..c17ae8d8a
--- /dev/null
+++ b/Assets/VRM/UniVRM/Editor/BlendShape/VRMBlendShapeProxyValidator.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 50a28b39ccee4874b85d99c095180e5a
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/VRM/UniVRM/Editor/Format/VRMExporterVaildator.cs b/Assets/VRM/UniVRM/Editor/Format/VRMExporterVaildator.cs
index 3a1fd6ea2..4fbc00a88 100644
--- a/Assets/VRM/UniVRM/Editor/Format/VRMExporterVaildator.cs
+++ b/Assets/VRM/UniVRM/Editor/Format/VRMExporterVaildator.cs
@@ -182,7 +182,7 @@ namespace VRM
         }
 
         /// <summary>
-        /// エクスポート可能か検証する
+        /// エクスポート可能か検証する。
         /// </summary>
         /// <returns></returns>
         public void Validate(GameObject ExportRoot, VRMExportSettings m_settings, VRMMetaObject meta)
@@ -192,34 +192,35 @@ namespace VRM
             {
                 return;
             }
+            var proxy = ExportRoot.GetComponent<VRMBlendShapeProxy>();
 
             m_validations.AddRange(_Validate(ExportRoot, m_settings));
-            if (ExportRoot != null)
+            m_validations.AddRange(VRMSpringBoneValidator.Validate(ExportRoot));
+            var firstPerson = ExportRoot.GetComponent<VRMFirstPerson>();
+            if (firstPerson != null)
             {
-                m_validations.AddRange(VRMSpringBoneValidator.Validate(ExportRoot));
-                var firstPerson = ExportRoot.GetComponent<VRMFirstPerson>();
-                if (firstPerson != null)
+                m_validations.AddRange(firstPerson.Validate());
+            }
+            if (proxy != null)
+            {
+                m_validations.AddRange(proxy.Validate());
+
+                // Export サイズ の 計算
+                var clips = new List<BlendShapeClip>();
+                if (proxy.BlendShapeAvatar != null)
                 {
-                    m_validations.AddRange(firstPerson.Validate());
+                    clips.AddRange(proxy.BlendShapeAvatar.Clips);
+                }
+
+                ExpectedByteSize = 0;
+                foreach (var renderer in ExportRoot.GetComponentsInChildren<Renderer>())
+                {
+                    var relativePath = UniGLTF.UnityExtensions.RelativePathFrom(renderer.transform, ExportRoot.transform);
+                    var mesh = GetMesh(renderer);
+                    ExpectedByteSize += CalcMeshSize(relativePath, mesh, m_settings, clips);
                 }
             }
             MetaHasError = meta.Validate().Any();
-
-            // サイズ の 計算
-            var proxy = ExportRoot.GetComponent<VRMBlendShapeProxy>();
-            var clips = new List<BlendShapeClip>();
-            if (proxy != null && proxy.BlendShapeAvatar != null)
-            {
-                clips.AddRange(proxy.BlendShapeAvatar.Clips);
-            }
-
-            ExpectedByteSize = 0;
-            foreach (var renderer in ExportRoot.GetComponentsInChildren<Renderer>())
-            {
-                var relativePath = UniGLTF.UnityExtensions.RelativePathFrom(renderer.transform, ExportRoot.transform);
-                var mesh = GetMesh(renderer);
-                ExpectedByteSize += CalcMeshSize(relativePath, mesh, m_settings, clips);
-            }
         }
 
         static bool ClipsContainsName(List<BlendShapeClip> clips, bool onlyPreset, BlendShapeBinding binding)
diff --git a/Assets/VRM/UniVRM/Editor/Format/VRMExporterWizard.cs b/Assets/VRM/UniVRM/Editor/Format/VRMExporterWizard.cs
index 127d8e2fa..8d6f92c65 100644
--- a/Assets/VRM/UniVRM/Editor/Format/VRMExporterWizard.cs
+++ b/Assets/VRM/UniVRM/Editor/Format/VRMExporterWizard.cs
@@ -178,6 +178,8 @@ namespace VRM
             if (Event.current.type == EventType.Layout)
             {
                 // ArgumentException: Getting control 1's position in a group with only 1 controls when doing repaint Aborting
+                // Validation により GUI の表示項目が変わる場合があるので、
+                // EventType.Layout と EventType.Repaint 間で内容が変わらないようしている。
                 if (m_requireValidation)
                 {
                     m_validator.Validate(ExportRoot, m_settings, Meta != null ? Meta : m_tmpMeta);
@@ -186,7 +188,7 @@ namespace VRM
             }
 
             //
-            // 事前チェック。ここで失敗する場合は Export UI を表示しない
+            // Humanoid として適正か？ ここで失敗する場合は Export UI を表示しない
             //
             if (!m_validator.RootAndHumanoidCheck(ExportRoot, m_settings))
             {
@@ -202,7 +204,7 @@ namespace VRM
             GUIUtility.GetControlID(645789, FocusType.Passive);
 
             //
-            // その他の Validation
+            // VRM の Validation
             //
             foreach (var v in m_validator.Validations)
             {