diff --git a/src/main/java/org/ntlab/citrusserver/resources/AccountsRest.java b/src/main/java/org/ntlab/citrusserver/resources/AccountsRest.java
index 48237dd..2eb5ccd 100644
--- a/src/main/java/org/ntlab/citrusserver/resources/AccountsRest.java
+++ b/src/main/java/org/ntlab/citrusserver/resources/AccountsRest.java
@@ -185,10 +185,10 @@
     // accountの色を返す(GET)
     @Path("/{account_id}/accountColor")
     @GET
-    @Produces(MediaType.TEXT_PLAIN)
+    @Produces(MediaType.APPLICATION_JSON)
     public String getAccountColor(@PathParam("account_id") String accountId){
         String accountColor = accountManager.getAccountColor(accountId);
-        return accountColor;
+        return "\"" + accountColor + "\"";
     }
 
     //accountの色を変更する(PUT)