PROBLEM TO BE SOLVED: To provide a two-component type oxidative hair dye and a first component for a bleach which can reduce irritating odor due to alkali agent at the time of operation and can effectively dye hair and bleach.SOLUTION: The two-component type oxidative hair dye and the first component for a bleach is used for oxidation-dyeing or bleaching the hair, each includes at least an alkali agent, and is characterized by containing (a) N-stearoyl amino acid salt, and (b) nonionic surface active agent.