Applying the first agent containing the reducing agent to the hair and leaving it for a predetermined time； washing the first agent applied to the hair； and applying the oxidizing second agent containing the oxidizing agent to the hair In the hair shaping treatment method comprising at least a step of leaving for a predetermined time and a step of washing away the second agent, the method further comprises a step of applying a hair treatment liquid containing gold nanoparticles to the hair, and a curly hair straightening treatment or a permanent wave. A hair shaping method which is a treatment. A hair treatment liquid for hair shaping treatment, which is applied to hair in hair shaping treatment and contains gold nanoparticles.還元剤を含有する第１剤を毛髪に塗布し、所定の時間放置する工程と、毛髪に塗布された第１剤を洗い流す工程と、毛髪に酸化剤を含有する酸化性第２剤を塗布し、所定の時間放置する工程と、第２剤を洗い流す工程と、を少なくとも備える毛髪成形処理方法において、金ナノ粒子を含む毛髪処理液を毛髪に塗布する工程をさらに備える縮毛矯正処理やパーマネントウェーブ処理である毛髪成形処理方法。また、毛髪成形処理において、毛髪に塗布される毛髪処理液であって、金ナノ粒子を含む毛髪成形処理用毛髪処理液。
