A two-part foam hair dye which comprises a first part comprising an alkali agent, a second part comprising hydrogen peroxide, and a non-aerosol foamer container, wherein the first part comprises the components (A) to (D), an equivalent ratio of a anion site of the component (A) to a cation site of the component (B) (anion/cation) is more than 1, a mass ratio of a content of the component (C) to the content of the component (D) ((C)/(D)) is 5 or less, and the liquid mixture has a viscosity (25°C) of 1 to 300 mPa·s: (A) a carboxylic acid anionic surfactant, (B) a polymer or copolymer having a mole fraction of diallyldimethyl quaternary ammonium salt monomer of 70% or more, (C) 0.5 to 1.5% by mass of an oxidation dye having a meta-dihydroxybenzene structure, and (D) 0.1 to 9% by mass of polypropyleneglycol of Mw 200 to 1200.
