diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/UnityWebRequestError.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/UnityWebRequestError.cs
index c5fe3ff..0005e4e 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/UnityWebRequestError.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/UnityWebRequestError.cs
@@ -10,13 +10,30 @@ namespace Cysharp.Threading.Tasks
         public UnityWebRequest UnityWebRequest { get; }
         public bool IsNetworkError { get; }
         public bool IsHttpError { get; }
+        public string Error { get; }
+        public string Text { get; }
+
+        string msg;
 
         public UnityWebRequestException(UnityWebRequest unityWebRequest)
-            : base(unityWebRequest.error + Environment.NewLine + unityWebRequest.downloadHandler.text)
         {
             this.UnityWebRequest = unityWebRequest;
             this.IsNetworkError = unityWebRequest.isNetworkError;
             this.IsHttpError = unityWebRequest.isHttpError;
+            this.Error = unityWebRequest.error;
+            this.Text = unityWebRequest.downloadHandler.text;
+        }
+
+        public override string Message
+        {
+            get
+            {
+                if (msg == null)
+                {
+                    msg = Error + Environment.NewLine + Text;
+                }
+                return msg;
+            }
         }
     }
 }