The present invention provides a prophylactic or therapeutic agent for depression or anxiety disorders, comprising (S)-N-[2-(1,6,7,8-tetrahydro-2H-indeno[5,4-b]furan-8-yl)ethyl]propionamide.本發明提供一種憂鬱症或焦慮症用預防或治療劑,包含(S)-N-[2-(1,6,7,8-四氫-2H-茚并[5,4-b]呋喃-8-基)乙基]丙醯胺。