To color the whole hair including hair roots with a simple operation, and to improve the smoothness of combing as well.

A hair dye applicator brush 1A comprises a brush section 4 where comb teeth 3 are planted in line, and a container 2 for containing the hair dye. Each comb tooth 3 which is formed in a plate shape, is provided with a fluid duct 7 therein for the hair dye, and has a plurality of dispensing orifices 9a, 9b for the hair dye opened on a surface which faces an adjacent comb tooth at different distant positions from the basal face 8 of the comb tooth. Besides, the opening area of the dispensing orifice 9a on an distal end 6 side in the comb tooth 3 is larger than that of the dispensing orifice 9b on the basal face 8 side in the comb tooth.