Disclosed is a novel therapeutic agent which is useful for the prevention or treatment of alopecia. Specifically disclosed is a prophylactic or therapeutic agent for alopecia, which comprises 1-[2-((2S)-2-[5-[(3,4-dimethoxyphenoxy)methyl]-1,2,4- oxadiazol-3-yl]pyrrolidin-1-yl)-1,1-difluoro-2-oxoethyl]- 3,3,5,5-tetramethylcyclohexanol as an active ingredient.