PROBLEM TO BE SOLVED: To provide a cosmetic and a skin external preparation comprising trehangelin as an active ingredient.SOLUTION: This invention provides a cosmetic and a skin external preparation comprising trehangelin represented by the following formula, where any one of R1-R3 is a 2-methylbut-2-enoyl group, any one of R4-R6 is a 2-methylbut-2-enoyl group, and the other is a hydrogen atom.COPYRIGHT: (C)2015,JPO&INPIT【課題】トレハンジェリンを有効成分とする化粧料及び皮膚外用剤の提供。【解決手段】下記式で表されるトレハンジェリンを含む化粧料及び皮膚外用剤の提供。[R1~R3のいずれか一つは2-メチルブタ-2-エノイル基、R4~R6のいずれか一つは2-メチルブタ-2-エノイル基、他は水素原子を示す。]【選択図】なし