Provided is a hair dye which assures good foaming and good foam quality when used in the form of a foam, while being prevented from the occurrence of dripping when used in the form of a viscous liquid. A multiple pack type hair dye, which comprises a first agent that contains an alkaline agent and a second agent that contains an oxidant, and which is applied to head hair in the form of a viscous liquid mixture of the first and second agents. The hair dye contains a component (A): 1-10% by mass of an ionic surfactant that contains a specific higher fatty acid and component (B): a higher alcohol. The mass ratio B/A is within the range of 0.1-3.
