Bearing apparatus for a driving wheel of vehicle

An object of the present invention is to provide a bearing apparatus for a driving wheel of vehicle which can prevent generation of stick-slip noise as well as fretting wear and thus can improve durability of the bearing apparatus. According to the present invention, there is provided a bearing apparatus for a driving wheel of vehicle comprising an outer member (10) formed with double row outer raceway surfaces (10a, 10a) on the inner circumferential surface thereof; an inner member (1, 27) formed with double row inner raceway surface (2a (24a), 3a) arranged oppositely to the double row outer raceway surfaces (10a, 10a); double row rolling elements (6) contained freely rollably between the outer and inner raceway surfaces (10a, 10a; 2a (24a), 3a) respectively of the outer and inner member (10; 1, 27); and a constant velocity universal joint (11, 26) for torque transmission inserted into the inner member (10; 1, 27) with abutting thereto and axially separably connected thereto via a nut (19) characterized in that the end surface (13a, 23a, 28a) of a shoulder (13, 28) of an outer joint member (15, 29) and the end surface of the inner member (1, 27) are previously formed so that these end surfaces line contact with each other at a vertex formed by inclined surfaces on the end of the inner member (1,27).