PROBLEM TO BE SOLVED: To provide a hair treating agent composition which can impart an excellent slipperiness, an excellent coated feeling, and excellent softness to the hair during rinsing.SOLUTION: A hair treating agent composition comprises a cellulose ether containing a cationic group (A) and at least one treating agent (B) selected from a dye for hair dyeing, an oxidizing agent, an alkali agent, and a keratin-reducing agent.COPYRIGHT: (C)2015,JPO&INPIT【課題】処理すすぎ時に、良好なすべり性とコート感、柔らかさを付与できる毛髪処理剤組成物を提供する。【解決手段】カチオン性基含有セルロースエーテル(A)、並びに染毛用染料、酸化剤、アルカリ剤、及びケラチン還元剤から選ばれる1種以上の処理剤(B)を含有する毛髪処理剤組成物である。【選択図】なし