PROBLEM TO BE SOLVED: To provide a food or a drug which exhibits excellent skin function-improving benefits such as a skin barrier function-improving benefit, a moisturizing benefit, a ceramide increase, and a keratinization ameliorating benefit.SOLUTION: Provided are a skin barrier function-improving agent, a skin ceramide-increasing agent, a skin moisturizing function-ameliorating agent, a keratinization ameliorating agent, etc., each of which contains as an active ingredient, a free 10-36C saturated fatty acid or a salt thereof.COPYRIGHT: (C)2009,JPO&INPIT【課題】皮膚バリア機能改善効果、保湿効果、セラミド増加、角化改善効果等の優れた皮膚機能改善効果を発揮する食品又は医薬品の提供。【解決手段】炭素数10~36の飽和の遊離脂肪酸又はその塩を有効成分とする皮膚バリア機能改善剤、皮膚セラミド増加剤、皮膚保湿機能改善剤、角化改善剤等。【選択図】なし