PROBLEM TO BE SOLVED: To provide a foam aerosol-type hair treatment agent readily uniformly applied to whole hair with foam during application to the hair and having excellent impartment of hair repairing effects with an amino acid or a water-soluble amino acid derivative and a smooth touch of the hair with a high-polymerization dimethylpolysiloxane and persistence thereof after the application.SOLUTION: The foam aerosol-type hair treatment agent is composed of a stock solution comprising (A) the high-polymerization dimethylpolysiloxane having 2,000-10,000 degree of polymerization, (B) the amino acid and/or the water-soluble derivative thereof, (C) a cationic cellulose derivative and/or a nonionic cellulose derivative and (D) water and a propellant. The foam aerosol-type hair treatment agent is characterized in that the formulation mass ratio (stock solution)/(propellant) of the stock solution to the propellant is within the range of (70/30) to (97/3).COPYRIGHT: (C)2009,JPO&INPIT【課題】毛髪への塗布時には泡沫により毛髪全体に均一に塗布し易く、塗布後はアミノ酸や水溶性アミノ酸誘導体による毛髪補修効果と、高重合ジメチルポリシロキサンによる毛髪のなめらかな感触の付与及びその持続性に優れた泡沫エアゾール型ヘアトリートメント剤を提供すること。【解決手段】(A)重合度2000~10000の高重合ジメチルポリシロキサン、(B)アミノ酸及び/又はその水溶性誘導体、(C)陽イオン性セルロース誘導体及び/又は非イオン性セルロース誘導体及び(D)水を含有する原液と、噴射剤とからなり、原液と噴射剤の配合質量比(原液)/(噴射剤)が70/30~97/3の範囲内にあることを特徴とする泡沫エアゾール型ヘアトリートメント剤。【選択図】なし