It is an object to provide a wrinkle improving agent having an excellent wrinkle improving action. A compound represented by the following general formula (1) or an acid addition salt thereof is used as an active ingredient of a wrinkle improving agent. (In the formula, X represents a C 1-2 alkylene group in which a hydrogen atom may be substituted with a methyl group, Y represents COOR 1 or CH 2 OR 2, and R 1 represents a carbon atom that may have a hydrogen atom or a branch. And represents an alkyl group having 1 to 6 carbon atoms, and R2 represents a hydrogen atom or an acyl group having 1 to 6 carbon atoms which may have a branch.)優れたシワ改善作用を有するシワ改善剤を提供することを課題とする。下記一般式（１）で表される化合物又はその酸付加塩をシワ改善剤の有効成分とする。（式中、Ｘは水素原子がメチル基で置換されていてもよい炭素数１～２のアルキレン基を表し、ＹはＣＯＯＲ１又はＣＨ２ＯＲ２を表し、Ｒ１は水素原子又は分岐を有してもよい炭素数１～６のアルキル基を表し、Ｒ２は水素原子又は分岐を有してもよい炭素数１～６のアシル基を表す。）
