Disclosed is a hair dyeing method wherein a hair dye composition having a first agent including an alkaline agent and a second agent including a oxidizing agent, wherein at least one of the first agent and second agent includes a surfactant, impregnates a structural body including a flexible porous material with an apparent density of 15 - 70 kg/m3 and a hardness of 50 - 250 N. Froth is formed by performing an operation that deforms the flexible porous material by means of the application and release of outside force thereupon, and the hair dye composition in froth form is applied to hair, allowed to sit for 3 - 60 minutes, and afterwards washed off.本發明提供一種頭髮染色方法,其係藉由如下方式而進行:使含有含鹼劑之第1劑及含氧化劑之第2劑、且第1劑及第2劑之至少一者中含有界面活性劑之染毛劑組合物,含浸於含有表觀密度為15~70 kg/m3、硬度為50~250 N之柔軟性多孔質材料的構造體中,藉由進行對柔軟性多孔質材料賦予外力與解除外力而使其變形之操作來使該染毛劑組合物起泡,將該泡狀之染毛劑組合物應用於毛髮,放置3~60分鐘後,進行沖洗。
