Bearing part, rolling bearing, and methods of manufacturing them

A method of manufacturing a bearing part comprising the steps of:

• fabricating a shaped member by shaping a steel containing not less than 0.90 mass % and not more than 1.05 mass % of carbon, not less than 0.15 mass % and not more than 0.35 mass % of silicon, not less than 0.01 mass % and not more than 0.50 mass % of manganese, and not less than 1.30 mass % and not more than 1.65 mass % of chromium with the rest consisting of an impurity;
• carbonitriding said shaped member;
• quench-hardening said shaped member carbonitrided;
• tempering said shaped member quench-hardened;
• and
• forming a contact surface, which is a surface to make contact with another part, by processing said shaped member tempered,
• in the step of carbonitriding said shaped member, said shaped member being carbonitrided so as to attain a nitrogen concentration of not less than 0.25 mass % in said contact surface in the step of forming said contact surface,
• in the step of tempering said shaped member, said shaped member being tempered to attain a remaining austenite amount of not less than 6 volume % and not more than 12 volume % in said contact surface, in the step of forming said contact surface.