Provided is a hair treatment method comprising steps (i) to (iii): step (i) is for applying a hair treatment agent containing a component (A) and a component (B) to hair； step (ii) is for letting the hair stand after step (i)； and step (iii) is for applying a hair treatment agent containing a component (C) to the hair after step (ii). (A) is a compound selected from among glycylglycine derivative, polyglycerol, and alkyl glyceryl ether. (B) is a carboxylic acid having an inorganic value of 250-450 and an organic value of 50-250 or a salt of the carboxylic acid. (C) is an aromatic sulphonic acid having a molecular weight of 300 or less or a salt thereof.本發明之毛髮處理方法包含步驟(i)～(iii)。 步驟(i)：將含有成分(A)及(B)之毛髮處理劑應用於毛髮之步驟 步驟(ii)：於步驟(i)之後放置毛髮之步驟 步驟(iii)：於步驟(ii)之後將含有成分(C)之毛髮處理劑應用於毛髮之步驟 (A)選自甘胺醯甘胺酸衍生物、聚甘油及烷基甘油醚之化合物 (B)無機性值為250～450且有機性值為50～250之羧酸或該羧酸之鹽 (C)分子量為300以下之芳香族磺酸或其鹽
