diff --git a/arai60/graph-bfs-dfs/number-of-islands/answer.md b/arai60/graph-bfs-dfs/number-of-islands/answer.md
new file mode 100644
index 0000000..a151fc1
--- /dev/null
+++ b/arai60/graph-bfs-dfs/number-of-islands/answer.md
@@ -0,0 +1,33 @@
+# 200. Number of Islands
+
+## STEP1
+
+```javascript
+```
+
+## STEP2
+
+```javascript
+```
+
+## STEP3
+
+```javascript
+```
+
+## 感想
+
+### コメント集を読んで
+
+## 他の人のPRを読んで
+
+## その他の方法
+
+### コードの良し悪し
+
+* `*0`
+
+* `*1`
+
+## 調べたこと
+