A rolling bearing cage (40, 140, 240, 340, 440, 540, 640, 740, 840, 940), which is arranged between a pair of raceway rings (10, 20) and configured to retain rolling elements at predetermined positions, the rolling bearing cage comprising: - an annular body having pocket holes for receiving the rolling elements; and - a resin portion formed through injection molding of a resin containing a solid lubricant with the annular body being set as an insert component, wherein the resin portion comprises: - first parts formed along inner peripheral surfaces of the pocket holes of the annular body to form pocket surfaces to be held in sliding contact respectively with the rolling elements; and - a second part formed along an inner peripheral surface or an outer peripheral surface of the annular body to form a guide surface to be held in sliding contact with one of the pair of raceway rings (10, 20), - the first parts and the second part being formed integrally with each other, and wherein weld lines of the resin portion are formed at positions of avoiding exposure of the weld lines at both end portions of the pocket surfaces in a circumferential direction of the rolling bearing cage, characterized in that a) a main-component resin of the resin portion contains: - a thermoplastic resin blended at a ratio of from 45 vol% to 80 vol%; - a solid lubricant blended at a ratio of from 20 vol% to 40 vol%; and - a reinforcing material blended at a ratio of from 0 vol% to 15 vol% or b) a thickness at both end portions of each of the first parts of the resin portion in the circumferential direction of the rolling bearing cage is larger than a thickness at both end portions of each of the first parts of the resin portion in the axial direction of the rolling bearing cage. - an annular body having pocket holes for receiving the rolling elements; and - a resin portion formed through injection molding of a resin containing a solid lubricant with the annular body being set as an insert component, - first parts formed along inner peripheral surfaces of the pocket holes of the annular body to form pocket surfaces to be held in sliding contact respectively with the rolling elements; and - a second part formed along an inner peripheral surface or an outer peripheral surface of the annular body to form a guide surface to be held in sliding contact with one of the pair of raceway rings (10, 20), - the first parts and the second part being formed integrally with each other, and a) a main-component resin of the resin portion contains: - a thermoplastic resin blended at a ratio of from 45 vol% to 80 vol%; - a solid lubricant blended at a ratio of from 20 vol% to 40 vol%; and - a reinforcing material blended at a ratio of from 0 vol% to 15 vol% or - a thermoplastic resin blended at a ratio of from 45 vol% to 80 vol%; - a solid lubricant blended at a ratio of from 20 vol% to 40 vol%; and - a reinforcing material blended at a ratio of from 0 vol% to 15 vol% b) a thickness at both end portions of each of the first parts of the resin portion in the circumferential direction of the rolling bearing cage is larger than a thickness at both end portions of each of the first parts of the resin portion in the axial direction of the rolling bearing cage.