Bearing device for vehicle wheel

A bearing device for a vehicle wheel, the bearing device comprising:

• an outer member having a plurality of rows of outer raceway surfaces on an inner periphery thereof and a flange portion to which a vehicle body side member is to be attached;
• an inner member including a hub ring including a small diameter step portion extending in an axial direction on an outer periphery of the hub ring and at least one inner ring press-fitted into the small diameter step portion of the hub ring, the inner member having a plurality of rows of inner raceway surfaces on an outer periphery thereof facing the plurality of rows of outer raceway surfaces;
• and
• a plurality of rows of rolling bodies rollably accommodated between the raceway surfaces of the inner member and the raceway surfaces of the outer member, wherein
• the outer member is provided with a pilot portion on a more inner side than the flange portion,
• the pilot portion has a fitting portion to be fitted to the vehicle body side member and a guide portion whose diameter gradually decreases from an inner-side end portion of the fitting portion toward an inner side,
• the guide portion includes a first tapered surface, a second tapered surface, and a chamfered portion,
• the first tapered surface is provided from the inner-side end portion of the fitting portion toward the inner side,
• the second tapered surface is provided from an inner-side end portion of the first tapered surface toward the inner side,
• the chamfered portion is provided at an inner-side end portion of the second tapered surface, and
• an inclination angle α of the first tapered surface with respect to a rotation axis of the bearing device is larger than an inclination angle β of the second tapered surface with respect to the rotation axis of the bearing device.