To provide a component such as a gear to be used after having been carburized, which has a predetermined strength and an abrasion resistance, and further has a graphite lubricant depositing on the surface, which is desirable for the use in a sliding component.

A steel material to be carburized has an alloy composition comprising, by wt.%, 0.10 to 0.30% C, 0.50 to 3.00% Si, 0.30 to 3.00% Mn, 0.030% or less P, 0.030% or less S, 0.01 to 1.00% Cu, 0.01 to 3.00% Ni, 0.30 to 1.00% Cr, 2.00% or less Mo, further, a specific amount of one or more elements among Al, Nb, Ti, N and B, while satisfying the condition of [Si%]+[Ni%]+[Cu%]-[Cr%]0.30, and the balance Fe with unavoidable impurities. The method for manufacturing the component includes forming the steel material to be carburized having the above composition into the component shape, subjecting the component to a vacuum carburizing operation of placing the component under a vacuum carburization condition and under a diffusion condition, and placing the component under the carburization condition again at least in the final step of the diffusion stage to produce graphite on the surface of the carburized component.