--- a/src/main/java/jp/ac/u_ryukyu/ie/cr/jungle/transaction/node/redBlackTree/RedBlackTreeNodeAttribute.java	Thu Jan 05 21:27:46 2017 +0900
+++ b/src/main/java/jp/ac/u_ryukyu/ie/cr/jungle/transaction/node/redBlackTree/RedBlackTreeNodeAttribute.java	Thu Jan 05 21:56:24 2017 +0900
@@ -33,7 +33,17 @@
 
     @Override
     public Either<Error, TreeNode> delete(String key) {
-        return null;
+        if (key == null) {
+            return DefaultEither.newA(NodeEditorError.NULL_VALUE_NOT_ALLOWED);
+        }
+
+        if (null == attrs.get(key)) {
+            return DefaultEither.newA(NodeEditorError.DELETE_KEY_NOT_FOUND);
+        }
+
+        TreeMap<String, ByteBuffer> newMap = attrs.delete(key);
+        ColorlessTreeNode newNode = node.createNode(newMap,balanceKey,value,node.left(),node.right());
+        return DefaultEither.newB(newNode);
     }
 
     @Override

--- a/src/main/java/jp/ac/u_ryukyu/ie/cr/jungle/transaction/node/redBlackTree/RedBlackTreeNodeChildren.java	Thu Jan 05 21:27:46 2017 +0900
+++ b/src/main/java/jp/ac/u_ryukyu/ie/cr/jungle/transaction/node/redBlackTree/RedBlackTreeNodeChildren.java	Thu Jan 05 21:56:24 2017 +0900
@@ -75,17 +75,22 @@
     }
 
 
+    /**
+     *     赤黒木はPathを使ったノードの削除は行わない
+     *     本気出したら実装できるから
+     *     余裕ができたら実装しよう
+     */
     @Override
     public Either<Error, TreeNode> deleteChildAt(int pos) {
         return null;
     }
 
+
     @Override
     public Either<Error, TreeNode> replaceNode(int pos, TreeNode replacement) {
         if (!boundaryCheck(pos)) {
             return DefaultEither.newA(NodeEditorError.INDEX_OUT_OF_BOUNDS);
         }
-
         ColorlessTreeNode newNode;
         if (pos == 0) { //左のノードを入れ替える場合
             newNode = node.createNode(attrs,node.key(),node.value(),(ColorlessTreeNode) replacement,node.right());

--- a/src/test/java/jp/ac/u_ryukyu/ie/cr/jungle/core/treeeditor/RedBlack/RedBlackTreeEditorAttributeTest.java	Thu Jan 05 21:27:46 2017 +0900
+++ b/src/test/java/jp/ac/u_ryukyu/ie/cr/jungle/core/treeeditor/RedBlack/RedBlackTreeEditorAttributeTest.java	Thu Jan 05 21:56:24 2017 +0900
@@ -15,9 +15,6 @@
 
 import java.nio.ByteBuffer;
 
-/**
- * Created by e115731 on 2017/01/05.
- */
 public class RedBlackTreeEditorAttributeTest {
     @Test
     public void RedBlackTreeEditorAttribute(){
@@ -41,21 +38,34 @@
         path = path.add(1);
         ByteBuffer value = ByteBuffer.wrap(path.toString().getBytes());
         Either<Error, JungleTreeEditor> either = editor.putAttribute(path, key, value);
-        Assert.assertFalse(either.isA()); //AttributeのPutが成功したかどうか
+        Assert.assertFalse(either.isA()); //AttributeのPutが成功したかどうか調べる
         editor = either.b();
         either = editor.success();
         Assert.assertFalse(either.isA());
 
         JungleTree oldTree = tree.getOldTree(tree.revision() - 1).b();
         TreeNode oldRoot = oldTree.getRootNode();
-        TreeNode newRoot = tree.getRootNode();
-        Assert.assertNotEquals(newRoot,oldRoot);// とりあえずルートがちゃんと入れ替えられているかを調べる
+        TreeNode attributePutedTreeRoot = tree.getRootNode();
+        Assert.assertNotEquals(attributePutedTreeRoot,oldRoot);// とりあえずルートがちゃんと入れ替えられているかを調べる
         TreeNode editedNode = tree.getNodeOfPath(path).b();
         TreeNode editedOldNode = oldTree.getNodeOfPath(path).b();
         String putValue = editedNode.getAttributes().getString(key);//編集したノードからputしたAttributeを取得
         Assert.assertEquals(putValue,path.toString());
         ByteBuffer nullValue = editedOldNode.getAttributes().get(key);//編集前のノードから値を取得 nullが取れる
         Assert.assertNull(nullValue);
+        ByteBuffer oldRootValue = oldRoot.getAttributes().get(balanceKey);
+        ByteBuffer newRootValue = attributePutedTreeRoot.getAttributes().get(balanceKey);//rootとかがちゃんと複製されているかを調べる
+        Assert.assertEquals(oldRootValue,newRootValue);
 
+        editor = tree.getJungleTreeEditor();
+        either = editor.deleteAttribute(path,key);
+        Assert.assertFalse(either.isA()); //Attributeのdeleteが成功したかどうか調べる
+        editor = either.b();
+        either = editor.success();
+        Assert.assertFalse(either.isA());
+
+        TreeNode AttributeDeletedNode = tree.getNodeOfPath(path).b();//Attributeがちゃんと削除できたかを調べる
+        nullValue = AttributeDeletedNode.getAttributes().get(key);
+        Assert.assertNull(nullValue);
     }
 }