A one-component or multi-component hair cosmetic comprising components (A) to (D), wherein the content of component (C) is 0.1% by mass or more and less than 20% by mass based on the total composition of the hair cosmetic. . (A): Compound selected from glyoxylic acid, glyoxylic acid hydrate, glyoxylate and glyoxylamide (B): having an electron donating group in at least one meta position, and at least one of ortho and para positions Phenol compound in which the position is H (the electron donating group at the meta position may form a benzene ring that may be substituted with OH together with the adjacent C atom) (C): an organic solvent having a boiling point of 100 ° C. or higher ( D): Water [selection figure] None成分(A)~(D)を含有し、成分(C)の含有量が毛髪化粧料の全組成を基準として0.1質量%以上20質量%未満である1剤式又は多剤式の毛髪化粧料。 (A):グリオキシル酸、グリオキシル酸水和物、グリオキシル酸塩及びグリオキシルアミドから選ばれる化合物 (B):メタ位の少なくとも1ヶ所に電子供与基を有し、オルト位とパラ位の少なくとも一か所がHであるフェノール化合物(メタ位の電子供与基は隣接するC原子と共にOHが置換してもよいベンゼン環を形成してもよい) (C):沸点が100℃以上である有機溶剤 (D):水【選択図】なし