diff --git a/src/main/java/org/ntlab/amaryllis/server/entities/Category.java b/src/main/java/org/ntlab/amaryllis/server/entities/Category.java
new file mode 100644
index 0000000..6c9997f
--- /dev/null
+++ b/src/main/java/org/ntlab/amaryllis/server/entities/Category.java
@@ -0,0 +1,38 @@
+package org.ntlab.amaryllis.server.entities;
+
+import java.awt.*;
+
+public class Category {
+    private String cid;
+    private String name;
+    private Color color;
+    public Category(String cid,String name,Color color){
+        this.cid=cid;
+        this.name=name;
+        this.color=color;
+    }
+
+    public String getcId() {
+        return cid;
+    }
+
+    public String getName() {
+        return name;
+    }
+    public Color getColor(){
+        return color;
+    }
+    public void setCid(String cid) {
+        this.cid = cid;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setColor(Color color) {
+        this.color = color;
+    }
+
+
+}
diff --git a/src/main/java/org/ntlab/amaryllis/server/models/Accounts.java b/src/main/java/org/ntlab/amaryllis/server/models/Accounts.java
index bd1cb7a..1ccacc8 100644
--- a/src/main/java/org/ntlab/amaryllis/server/models/Accounts.java
+++ b/src/main/java/org/ntlab/amaryllis/server/models/Accounts.java
@@ -8,6 +8,10 @@
 
 public class Accounts {
     private static Accounts theInstance = null;
+    /**
+     * @param String アカウントのuid
+     * @param Account アカウント
+     */
     private HashMap<String,Account> accountHashMap=new HashMap<>();
     public static Accounts getInstance() {
         if (theInstance == null) {
diff --git a/src/main/java/org/ntlab/amaryllis/server/models/Categories.java b/src/main/java/org/ntlab/amaryllis/server/models/Categories.java
new file mode 100644
index 0000000..fa35513
--- /dev/null
+++ b/src/main/java/org/ntlab/amaryllis/server/models/Categories.java
@@ -0,0 +1,52 @@
+package org.ntlab.amaryllis.server.models;
+
+import org.ntlab.amaryllis.server.entities.Category;
+
+import java.awt.*;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Set;
+
+public class Categories {
+    private  static Categories theInstance=null;
+    /**
+     * cidでひも付けされたカテゴリのハッシュマップ
+     */
+    private HashMap<String, Category> categoryHashMap;
+    public static Categories getInstance(){
+        if(theInstance==null){
+            theInstance=new Categories();
+        }
+        return  theInstance;
+    }
+    private void addCategory(String cid, String name, Color color){
+        categoryHashMap.put(cid,new Category(cid,name,color));
+    }
+    /**
+     * インスタンス生成を禁止するコンストラクタ
+     */
+    private Categories(){
+        categoryHashMap =new HashMap<String, Category>();
+        {
+            addCategory("","",new Color(1,1,1));
+        }
+    }
+
+    /**
+     * 持っているカテゴリを全て取得するメソッド
+     * @return  持っているカテゴリのリスト
+     */
+    public ArrayList<String> getCategoryList() {
+        return new ArrayList<>(categoryHashMap.keySet());
+    }
+
+    /**
+     * cidからカテゴリを返すメソッド
+     * @param cid　カテゴリのcid
+     * @return cidと対応したカテゴリ
+     */
+    public Category getCategory(String cid){
+        return categoryHashMap.get(cid);
+    }
+
+}