Disclosed is an aqueous hair cleansing agent containing 1 to 30 mass% of a sulfate-based anionic surfactant (A) represented by R1O(CH2CH2O)nSO3M (1) (in the formula, R1 represents a C10-18 alkyl group or alkenyl group, and n represents a number between 0 and 5), 0.1 to 10 mass% of a polyoxypropylene alkyl ether-based nonionic surfactant (B) represented by R2O(CH2CH(CH3)O)mH (2) (in the formula, R2 represents a C8-10 alkyl group or alkenyl group, and m represents a number between 0.5 and 4), 0.1 to 5 mass% of a monoalkyl glyceryl ether- or monoalkenyl glyceryl ether-based nonionic surfactant (C) having a C4-12 alkyl group or alkenyl group, and 0.1 to 10 mass% of an alkylhydroxy sufobetaine-based amphoteric surfactant (D) represented by formula (3) (in the formula, R3 represents a C10-14 alkyl group) such that the mass ratio of component (B) and component (D) is 3/2 to 1/4 when (B)/(D).本發明之水性毛髮洗淨劑含有以下成分(A)、(B)、(C)、及(D):(A)下述通式(1)所表示之硫酸鹽型陰離子界面活性劑1~30質量%、R1O(CH2CH2O)nSO3M (1)(上述通式(1)中,R1表示碳數為10~18之烷基或烯基,M表示鹼金屬、鹼土金屬、銨、烷醇胺或鹼性胺基酸,n表示以質量平均計為0~5之數)(B)下述通式(2)所表示之聚氧丙烯烷基醚型非離子界面活性劑0.1~10質量%、R2O(CH2CH(CH3)O)mH (2)(上述通式(2)中,R2表示碳數為8~10之直鏈或支鏈烷基或烯基,m表示以質量平均計為0.5~4之數)(C)具有碳數為4~12之烷基或烯基之單烷基甘油醚或單烯基甘油醚型非離子界面活性劑0.1~5質量%、(D)下述通式(3)所表示之烷基羥基磺基甜菜鹼型兩性界面活性劑0.1~10質量%(下述通式(3)中,R3表示碳數為10~14之烷基);且成分(B)及(D)之質量比例為(B)/(D)=3/2~1/4。
