A powder hair dye composition containing sodium percarbonate with an active oxygen amount within a range of 12.0 to 15.3 % by mass as a component (A), additionally containing a sequestering agent as a component (B) preferably and still additionally the sulfate salt of an oxidation dye as a component (C) more preferably.In accordance with the invention, the dyeability and bleaching ability of the powder hair dye composition can be enhanced, together with the resulting good hair feeling after application additionally, the increase of oxygen gas pressure in the storage package can be suppressed, and the storage stability of the powder hair dye composition can be retained in a secure fashion.
