diff --git a/app/src/main/java/com/example/sprout/refactor/adapter/DiffCallback.java b/app/src/main/java/com/example/sprout/refactor/adapter/DiffCallback.java
deleted file mode 100644
index aa637c3..0000000
--- a/app/src/main/java/com/example/sprout/refactor/adapter/DiffCallback.java
+++ /dev/null
@@ -1,38 +0,0 @@
-package com.example.sprout.refactor.adapter;
-
-import android.support.v7.util.DiffUtil;
-
-import java.util.List;
-
-/**
- * DiffUtilのCallbackの基底クラス
- *
- * @param <T> 差分を出すクラス
- * @author matsumoto_k
- */
-public abstract class DiffCallback<T> extends DiffUtil.Callback {
-    final protected List<T> oldList;
-    final protected List<T> newList;
-
-    public DiffCallback(List<T> oldList, List<T> newList) {
-        this.oldList = oldList;
-        this.newList = newList;
-    }
-
-    @Override
-    public int getOldListSize() {
-        return oldList.size();
-    }
-
-    @Override
-    public int getNewListSize() {
-        return newList.size();
-    }
-
-    @Override
-    public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
-        return oldList.get(oldItemPosition) == newList.get(newItemPosition);
-    }
-
-    public abstract Object getChangePayload(int oldItemPosition, int newItemPosition);
-}