PROBLEM TO BE SOLVED: To provide a foam aerosol for external use on the skin which can jet a cosmetic blended with a water-soluble chemical and ethanol such as a skin care cosmetic as a propellant while being foamed.SOLUTION: The foam aerosol for external use on the skin uses a composition containing (A) 0.1 to 5.0 mass% of an anionic thickener obtained by bringing the mixture of prescribed water-soluble ethylenically unsaturated monomers into polymerization reaction, (B) a water-soluble chemical and (C) ethanol as a stock solution, and uses carbon dioxide as the propellant. The aerosol agent performs jetting while being foamed from an aerosol container.COPYRIGHT: (C)2012,JPO&INPIT【課題】スキンケア化粧品など水溶性薬剤やエタノールを配合した化粧料を炭酸ガスを噴射剤として安定して発泡しながら噴射することができる泡沫皮膚外用エアゾール剤を提供する。【解決手段】(A)所定の水溶性エチレン性不飽和モノマーの混合物を重合反応させて得られるアニオン性増粘剤0.1~5.0質量%と、(B)水溶性薬剤と、(C)エタノールと、を含有する組成物を原液とし、炭酸ガスを噴射剤とするエアゾール剤であって、該エアゾール剤がエアゾール容器から発泡しながら噴射する泡沫皮膚外用エアゾール剤。【選択図】図1