PROBLEM TO BE SOLVED: To provide a new therapeutic agent useful for the prevention or treatment of alopecia.SOLUTION: An agent for the prevention or treatment of alopecia contains a compound represented by the following formula or a pharmaceutically acceptable salt thereof.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】脱毛症の予防又は治療に有用な新たな治療薬の提供。【解決手段】下記式で表される化合物又はその医薬上許容される塩を含有することを特徴とする脱毛症の予防又は治療剤。【選択図】図1