ROLLING BEARING

摘要

The quantity of residual austenite (³ RAB ) in a surface layer part of an inner ring (1) and of an outer ring (2) exceeds 0 vol.%. A ball (rolling element) (3) is obtained by processing a raw material comprising a steel alloy which contains 0.3-2.2 mass % of Si and 0.3 mass % to not more than 2.0 mass % of Mn and in which the Si/Mn mass ratio is not higher than 5, and then carrying out heat treatment, including carbonitriding or nitriding. Si·Mn-based nitrides comprising nitrides of silicon (Si) and nitrides of manganese (Mn) are present on the rolling surface of the ball (3) at an areal ratio of 1.0-20.0%. The content of N in the surface part of the ball (3) is 0.2 mass % to not more than 2.0 mass %, and the quantity of residual austenite (³ RC ) is higher than 0 vol.% and not higher than 50 vol.% and satisfies formula (1). ³ RAB -15 ‰¤ ³ RC ‰¤ ³ RAB +15 (1)