PROBLEM TO BE SOLVED: To provide a hair dyeing pretreatment agent that reduces damage to hair caused by hair dyeing and is excellent in the feel, coloring and color durability of the hair.SOLUTION: The hair dyeing pretreatment agent contains a compound represented by a component (A) of formula (1) in the figure or a salt thereof. [In the formula, each symbol is as described in the specification.]SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】本発明は、染毛による毛髪のダメージを抑え、毛髪の感触、発色および色持ちに優れた染毛前処理剤を提供することを目的とする。【解決手段】成分(A):式(1)[式中、各記号は明細書に記載の通りである。]で示される化合物またはその塩を含有する染毛前処理剤。【選択図】なし
