| 摘要 |
An inner ring and an outer ring are composed as follows. These members are fabricated with a steel for bearing containing carbon 0.6 wt % or higher. A carbonitrided layer is formed in a raceway surface. The amount of residual austenite at a position of 2% Da depth in the raceway surface is determined to be 1.0 vol % or lower. Hardness at the position of 2% Da depth is set to be HRC58 or more. Nitrogen content (Np) at the position of 2% Da depth is 0.05 wt % or more. A multiple Gd of an impression resistance expressed with the following formula (1) is 1.6 or more, <paragraph lvl="0"><in-line-formula>Gd=(H0.2/500)+2.Np (1), </in-line-formula>wherein in the formula, H0.2 is meant by Vickers hardness at the position of 2% Da depth.
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