PROBLEM TO BE SOLVED: To provide a hair cleansing agent that provides hair with excellent appearance stability and further provides excellent smoothness, and excellent voluminousness and fluffiness at the top of head, during the rinsing of hair that have been altered with aging and are damaged by being color-treated repeatedly such as conducting hair dye.SOLUTION: A hair cleansing agent composition comprises (A) a non-soap anionic surfactant, (B) an amphoteric surfactant, and (C) a cationic chitosan, wherein: the ratio (B/A) of the content (mass%) of the non-soap anionic surfactant (A) and the content (mass%) of the amphoteric surfactant (B) is 1.5 to 30 and the ratio (A/C) of the content (mass%) of the non-soap anionic surfactant (A) and the content (mass%) of the cationic chitosan (C) is 1 to 100.
