Patent ID: 8083868

Claim:
A rolling bearing comprising an outer ring, an inner ring and a plurality of rolling elements disposed between the outer and inner rings, wherein at least a member selected from the outer ring, inner ring and rolling elements is such that: the content of C is not less than 0.2 wt %, not more than 0.6 wt %; the content of Cr is not less than 2.5 wt %, not more than 7.0 wt %; the content of Mn is not less than 0.5 wt %, not more than 2.0 wt %; the content of Si is not less than 0.1 wt %, not more than 1.5 wt %; the content of Mo is not less than 0.5 wt %, not more than 3.0 wt %; and the balance is Fe and inevitable impurities; a carburizing or carbo-nitriding treatment, a quenching treatment and a tempering treatment are applied thereto so that: the volume % of retained austenite on a surface thereof is not less than 15%, not more than 45%; the surface hardness is not less than HRC60; a Fe—Cr, Mo system precipitate comprises at least one of double carbonitrides of M 7 C 3 , M 23 C 6 , M 7 (C, N) 3 and M 23 (C,N) 6 ; and the Fe—Cr, Mo system precipitate contains 30 wt % or more of Cr and Mo in total to heighten a melting point of the Fe—Cr, Mo system precipitate and to suppress a phase transformation of the Fe—Cr, Mo system, and wherein the selected member is further such that: the sum of carbon concentration and nitrogen concentration on the surface thereof is not less than 1.0 wt % and not more than 2.5 wt %.