diff --git a/src/main/java/org/ntlab/acanthus_server/entities/Account.java b/src/main/java/org/ntlab/acanthus_server/entities/Account.java
index 945a305..ce7d2b2 100644
--- a/src/main/java/org/ntlab/acanthus_server/entities/Account.java
+++ b/src/main/java/org/ntlab/acanthus_server/entities/Account.java
@@ -133,6 +133,7 @@
 
     //-----------------------------------------------------------------
     // 招待されている作品を返す
+    @JsonIgnore
     public HashMap<Integer, Work> getInvitedMap() {
         var invitedMap = new HashMap<Integer, Work>();
 
@@ -147,6 +148,7 @@
 
     //-----------------------------------------------------------------
     // 参加している作品を返す
+    @JsonIgnore
     public HashMap<Integer, Work> getWorkingMap() {
         var workingMap = new HashMap<Integer, Work>();