[Problem] In a shaft member of a wheel rolling bearing device, local concentration of stress (stress concentration) which is generated by a load applied to flange portions that are formed by cold forging is suppressed. [Means for Resolution] A flange porti...

[Problem] In a shaft member of a wheel rolling bearing device, local concentration of stress (stress concentration) which is generated by a load applied to flange portions that are formed by cold forging is suppressed. [Means for Resolution] A flange porti...

A flange portion provided on a shaft member of a rolling bearing device for a wheel includes an outer flange portion; and an inner flange portion formed thicker than the outer flange portion as seen in a cross section. The inner flange portion is formed in...