PROBLEM TO BE SOLVED: To provide an aerosol-type foamy oxidative hair dye composition which can minimize the irritating odor of an alkali agent such as ammonia, and further ensures excellent mixability of a first component and a second component which are discharged at the time of application in foamy states and can keep excellent hair-dyeing properties.SOLUTION: An aerosol-type foamy oxidative hair dye composition is used in a manner such that at the time of application, both a first component that contains an alkali agent selected from ammonia and ammonium salts and a second component that contains an oxidizing agent are discharged in foamy states and mixed, wherein the ratio of the foam specific gravity (f2) of the second component to that (f1) of the first component, f2/f1, is 1.1 to 3 at the point of time of discharging the components.
