PROBLEM TO BE SOLVED: To provide a decolorization or a hair dye composition which is excellent in finger combing at the time of a shampoo, can achieve a glossy and firmly settled hair, and further is excellent in continuity of such effects.SOLUTION: A decolorization or a hair dye composition contains components (A) and (B): (A) a cationic polymer with a charge density of 5.0-7.0 meq/g (B) an anionic polymer with a weight average molecular weight of 500 or more and 50,000 or less, represented by general formula (1) [where, m and n represent molar ratios, and m+n=100.]COPYRIGHT: (C)2015,JPO&INPIT