And a GPR119 agonist activity, the present invention is useful for the prophylaxis or treatment of diabetes, obesity, etc., Expression (I) Wherein each symbol is as described in the specification] is a compound or a salt thereof represented by. None [Selection Figure]本発明は、GPR119アゴニスト作用を有し、糖尿病、肥満症等の予防・治療に有用な、式(I)[式中、各記号は明細書記載のとおり]で表される化合物またはその塩である。【選択図】なし