The present invention relates to a hair dye composition, and more particularly, to a foam-type hair dye composition comprising: a first agent including a dye and an alkaline agent and a second agent including an oxidant; and a nonionic viscosity increasing agent of a PEG-aliphatic acid ester or a PPG-aliphatic acid ester in one or both of the first agent and the second agent, thereby largely improving dyeing properties without dripping after the composition is coated on hair.