A hair dye comprising at least 0.3 to 2% by mass of at least one of acid dyes, 0.5 to 6% by mass of a film-forming resin, 15 to 55% by mass of alcohol having 7 or less carbon atoms and 20% by mass or more of water and having a pH modified to 2 to 5, wherein the hair dye contains particles having an average particle diameter of 0.3 to 3 μm is provided as a hair dye which does not require washing of the hairs immediately after used and which is excellent not only in a hair dyeing property immediately after applied but also such a cumulative hair dyeing property as gradually dyeing the hairs at every frequency of repeating use thereof.