A hair treatment agent that comprises components (A) to (D) and water, wherein the ratio by mass of component (C) to component (D) [(C)/(D)] is 0.1-20 inclusive: (A) 0.1-2 mass% inclusive, in terms of succinic acid, of succinic acid or a salt thereof； (B) 0.5-15 mass% inclusive of erythritol； (C) at least one kind of aromatic alcohol selected from the group consisting of benzyl alcohol, phenoxyethanol and benzyloxyethanol； and (D) 0.01-5 mass% inclusive of at least one kind of polyoxyalkylene glycol that carries an alkylene group having 2 or 3 carbon atoms.本發明係一種毛髮處理劑，其含有成分(A)~(D)及水，且成分(C)與成分(D)之質量比(C)/(D)為0.1以上且20以下，(A)琥珀酸或其鹽以琥珀酸計為0.1質量%以上且2質量%以下(B)丁四醇0.5質量%以上且15質量%以下(C)選自由苄醇、苯氧基乙醇及苄氧基乙醇所組成之群中之至少1種之芳香族醇(D)伸烷基之碳數為2或3之聚氧伸烷基二醇之至少1種0.01質量%以上且5質量%以下。
