To provide a skin external preparation that is excellent in effectiveness and quality stability as well as biological safety, the skin external preparation having a body hair growth inhibitory effect.SOLUTION: The present invention provides a skin external preparation for inhibiting body hair growth, containing an extract or fermented product of Zostera plant as an active ingredient.SELECTED DRAWING: None【課題】有効性と品質安定性、さらには生体安全性にすぐれた体毛成長抑制効果を有する皮膚外用剤の提供。【解決手段】アマモ属(Zostera)に属する植物の抽出物又は発酵物を有効成分とする体毛成長抑制用の皮膚外用剤。【選択図】なし