The invention provides a novel wrinkle-improving agent that has an effect of improving wrinkles, that does not entail problems of safety or pain even when applied to the skin, and that contains a very safe substance as an active component. A discovery was made that N-benzoyl-²-alanine, other specific ²-alanine derivatives, and salts thereof have a wrinkle-improving effect, whereby a wrinkle-improving agent containing as an active component one, two, or more types of compounds selected from the group composed of these specific ²-alanine derivatives and the salts thereof was developed.本發明之課題係提供一種含有具改善皺紋作用，且即使塗抹於皮膚上亦無伴隨著疼痛之安全性上問題，亦即以具有上述特徵之高安全性物質為有效成分之新穎的改善皺紋用劑。；其解決方法係藉由發現N－苯醯基－β－丙胺酸等之特定的β－丙胺酸衍生物及其鹽具有改善皺紋之作用，進而開發一種含有以1種或2種以上選自前述特定的β－丙胺酸衍生物及其鹽所成群之化合物作為有效成分之改善皺紋用劑。
