The invention provides a hair treatment agent composition which can give good tidiness and excellent touch of hair at the end of treatment. The hair treatment agent composition of the invention comprises the following components (a) and (b):(a) the compound represented by general formula (1):R1o - (PO) n (EO) m-r2 (1)(in the formula, R1 is alkyl or alkenyl of straight or branched chain with carbon number of 8-12, Po is propoxy, EO is ethoxy, average number of addition moles n is 1.5-5.0, average number of addition moles m is 0-1.0, R2 is hydrogen atom or methyl)；(b) it is selected from more than one of cuticle reducing agent, oxidant, alkali agent and hair dye, and r1oh (where R1 represents straight chain or branched alkyl or alkenyl with carbon number of 8-12) content is less than 300 ppm.本發明提供一種於處理完畢時可賦予良好之整齊性及毛髮之優異觸感之毛髮處理劑組合物。本發明之毛髮處理劑組合物含有以下成分(A)及(B)：(A) 通式(1)所表示之化合物：R1O-(PO)n(EO)m-R2 (1)(式中，R1表示碳數8~12之直鏈或支鏈之烷基或烯基，PO表示伸丙氧基，EO表示伸乙氧基，平均加成莫耳數n表示1.5~5.0之數，平均加成莫耳數m表示0~1.0之數，R2表示氫原子或甲基)；(B) 選自角質還原劑、氧化劑、鹼劑及染髮用染料中之一種以上；且R1OH(式中，R1表示碳數8~12之直鏈或支鏈之烷基或烯基)之含量為300 ppm以下。
