Foam-type external preparation for skin that is compatible with the amount of foam-holding power of carbon dioxide gas to appeal can not be obtained easily in the foam-type skin external preparation of the conventional, visual users, the goodness of the use of the anti-sagging and the like from the skin I provide. Foam-type external preparation for the skin as an essential component to a hydrophobic alkyl modified cellulose.従来の発泡型皮膚外用剤では容易に得られなかった、使用者の視覚に訴える炭酸ガスの発泡量・保持力と、肌からの垂れ防止等の使用性の良さを両立した発泡型皮膚外用剤を提供する。疎水化変性アルキルセルロースを必須成分とする発泡型皮膚外用剤。
