diff --git a/src/main/java/org/ntlab/amaryllis/server/entities/Category.java b/src/main/java/org/ntlab/amaryllis/server/entities/Category.java
index da3fd6f..5995619 100644
--- a/src/main/java/org/ntlab/amaryllis/server/entities/Category.java
+++ b/src/main/java/org/ntlab/amaryllis/server/entities/Category.java
@@ -1,10 +1,15 @@
 package org.ntlab.amaryllis.server.entities;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
+import java.util.ArrayList;
+
 import static java.util.UUID.randomUUID;
 
 public class Category {
-    String categoryId;
-    String categoryName;
+    private String categoryId;
+    private String categoryName;
+    private ArrayList<String> categorylist = new ArrayList<>();//そのcategoryが登録されているvidのリスト
 
     public Category(String categoryName) {
         this.categoryId = randomUUID().toString();
@@ -17,5 +22,19 @@
     public String getCategoryName() {
         return categoryName;
     }
+    public ArrayList<String> getCategorylist() {
+        return categorylist;
+    }
+    public void addCategorylist(String vid) {
+        for (String a : categorylist) {
+            if (a.equals(vid)) {
+                return;
+            }
+            this.categorylist.add(vid);
+        }
+    }
+    public void removeCategorylist(String vid) {
+        categorylist.remove(vid);
+    }
 
 }
\ No newline at end of file