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 06a0dd4..7880fe8 100644
--- a/src/main/java/org/ntlab/amaryllis/server/entities/Category.java
+++ b/src/main/java/org/ntlab/amaryllis/server/entities/Category.java
@@ -15,4 +15,5 @@
         this.categoryName = categoryId;
     }
 
-}
+
+}
\ No newline at end of file
diff --git a/src/main/java/org/ntlab/amaryllis/server/models/Categories.java b/src/main/java/org/ntlab/amaryllis/server/models/Categories.java
index 392ee5f..67df834 100644
--- a/src/main/java/org/ntlab/amaryllis/server/models/Categories.java
+++ b/src/main/java/org/ntlab/amaryllis/server/models/Categories.java
@@ -1,6 +1,30 @@
 package org.ntlab.amaryllis.server.models;
 
-public class Categories {
+import org.ntlab.amaryllis.server.entities.Category;
+import org.ntlab.amaryllis.server.entities.Voicememo;
+import java.util.ArrayList;
 
+public class Categories {
+    private static org.ntlab.amaryllis.server.models.Categories theInstance = null;
+    private static ArrayList<Category> Categories = new ArrayList<>();
+
+    private Categories() {
+        createCategory("旅行");
+        createCategory("音楽");
+        createCategory("グルメ");
+    }
+
+    public static Categories getInstance() {
+        if (theInstance == null) {
+            theInstance = new Categories();
+        }
+        return theInstance;
+    }
+
+    public Category createCategory(String categoryName) {
+        Category newCategory = new Category(categoryName);
+        Categories.add(newCategory);
+        return newCategory;
+    }
 
 }