diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4412a793..511b5ef4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 [Read translated version (en)](./translations/en/CHANGELOG.md)
 
+- インタプリタがreturn文を文字列化できるように
+
 # 0.13.2
 - `Date:year`,`Date:month`,`Date:day`,`Date:hour`,`Date:minute`,`Date:second`に時間数値の引数を渡して時刻指定可能に
 - array.sortとString用比較関数Str:lt, Str:gtの追加
diff --git a/src/interpreter/util.ts b/src/interpreter/util.ts
index d7df51b0..c6b5d45c 100644
--- a/src/interpreter/util.ts
+++ b/src/interpreter/util.ts
@@ -100,6 +100,7 @@ export function valToString(val: Value, simple = false): string {
 		if (val.type === 'str') return `"${val.value}"`;
 		if (val.type === 'arr') return `[${val.value.map(item => valToString(item, true)).join(', ')}]`;
 		if (val.type === 'null') return '(null)';
+		if (val.type === 'return') return valToString(val.value, true);
 	}
 	const label =
 		val.type === 'num' ? val.value :
@@ -108,6 +109,7 @@ export function valToString(val: Value, simple = false): string {
 		val.type === 'fn' ? '...' :
 		val.type === 'obj' ? '...' :
 		val.type === 'null' ? '' :
+		val.type === 'return' ? valToString(val.value) :
 		null;
 	return `${val.type}<${label}>`;
 }