PURPOSE: To provide a bearing parts having a long service life even in soiled oil mixed with foreign matters having a specified hardness or above by forming it from carburizing steel and specifying the surface hardness and the amt. of surface retained austenite.

CONSTITUTION: This bearing parts is the one in which surface hardness is regulated to 64 to 69 by Rockwell C hardness (HRC) and the amt. of surface retained austenite is regulated to 13 to 20%. This bearing parts has a long service life even if being used in soiled oil mixed with foreign matters of ≥64 HRC. Namely, since its surface hardness is high, flaws by foreign matters causing peeling are less apt to generate, and since the amt. of retained austenite is regulated to ≥13%, the propagation of cracks can be suppressed. This bearing parts can be produced by a method comprising a step in which, e.g. worked bearing parts stock formed from carburizing steel into a prescribed shape is subjected to each treatment of carburizing and quanching treatment, preliminary tempering treatment, subzero treatment and regular tempering treatment.