PROBLEM TO BE SOLVED: To provide a hair treatment method which can dye the hair and impart a semi-permanent or permanent shape and is also excellent in the shape-imparting effect and dyed color fastness.SOLUTION: There is provided a hair treatment method which comprises the following steps (i) to (iii) and dyes the hair and transforms the hair semi-permanently or permanently: (i) a step of dyeing the hair by hair treatment for making a dye to act on the hair； (ii) a step of making the following components (A) to (C) to act on the hair: (A) a compound selected from glyoxylic acid, a glyoxylic acid hydrate, a glyoxylic acid salt and glyoxylamide, (B) a phenol compound having an electron-donating group at least one site at the meta-position in which at least one site at the ortho-position or para position is H (the electron-donating group at the meta-position may form a benzene ring which may be substituted with OH together with the adjacent carbon atoms) and (C) a water； and (iii) a step of heating and styling the hair.SELECTED DRAWING: None【課題】毛髪に対して染色と共に半永久的ないし永久的な形状付与が可能であり、その形状付与効果及び染色堅牢性にも優れる毛髪処理方法の提供。【解決手段】工程(ｉ)～(iii)を含む、毛髪を染色し、かつ半永久的ないし永久的に変形する毛髪処理方法。 (ｉ) 染料を毛髪に作用させる毛髪処理によって、毛髪を染色するステップ (ii) 成分(A)～(C)を毛髪に作用させるステップ (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)：水 (iii) その後毛髪を加熱して形付けするステップ【選択図】なし
