Rolling bearing device for wheel

摘要

The present invention relates to a rolling bearing device for a wheel comprising a rotary ring having a flange including a plurality of arm portions formed with through holes to which hub bolts for fitting a brake rotor and a wheel of a vehicle are fixed, and extended radially outward in a radial direction, the brake rotor being secured by being butted against outer side surfaces of the arm portions directed to an outward side of the vehicle; a fixed ring which is fixed to the vehicle side and arranged concentrically with the rotary ring; and a plurality of rolling elements which are disposed between the rotary ring and the fixed ring so as to freely roll, wherein inner side surfaces of the arm portions directed to an inward side of the vehicle are provided with thick wall parts which are formed thick by protruding inward into the vehicle than bolt seat surfaces of the arm portions with which head parts of the hub bolts are contacted and extended from the rotary ring radially outwardly along both side edges of the arm portions so as to surround the head parts of the hub bolts except for portions of the head parts corresponding to radially outside portions of the arm portions.