A bearing device for a wheel, comprising: a bearing comprising: an outer member; an inner member comprising a hub wheel and an inner ring; and double-row rolling elements (3,4) arranged between double-row outer raceway surfaces (13,14) formed on an inner periphery of the outer member, and double-row inner raceway surfaces (7,8) formed on an outer periphery of the inner member; a constant velocity universal joint comprising: an outer joint member comprising a mouth section and a stem section; an inner joint member accommodated in the mouth section; and a plurality of torque transmitting members arranged between the outer joint member and the inner joint member; a bolt which is inserted from an outboard side through a bolt insertion hole formed in the hub wheel, and threadedly engaged and fastened into a bolt hole formed in an end portion of the stem section on the outboard side, so as to connect the bearing and the constant velocity universal joint to each other; convex portions, which extend in an axial direction, formed on any one of an outer peripheral surface of the stem section and an inner peripheral surface of the hub wheel; concave portions, which extend in the axial direction, formed on another one of the outer peripheral surface of the stem section and the inner peripheral surface of the hub wheel, the concave portions being fitted to the convex portions so as to allow torque transmission; and a guide portion formed on the outer peripheral surface of the stem section or the inner peripheral surface of the hub wheel, the guide portion is configured to guide start of fitting between the convex portions and the concave portions by being fitted to the stem section or the hub wheel with a gap.therebetween, wherein under a state in which an entire range of the guide portion is fitted to the stem section or the hub wheel with a gap therebetween and the convex portions and the concave portions do not fit to each other, a maximum inclination angle (θ 2) of the bolt with respect to the hub wheel is set to be larger than a maximum inclination angle (θ 1) of the outer joint member with respect to the hub wheel. a bearing comprising: an outer member; an inner member comprising a hub wheel and an inner ring; and double-row rolling elements (3,4) arranged between double-row outer raceway surfaces (13,14) formed on an inner periphery of the outer member, and double-row inner raceway surfaces (7,8) formed on an outer periphery of the inner member; an outer member; an inner member comprising a hub wheel and an inner ring; and double-row rolling elements (3,4) arranged between double-row outer raceway surfaces (13,14) formed on an inner periphery of the outer member, and double-row inner raceway surfaces (7,8) formed on an outer periphery of the inner member; a constant velocity universal joint comprising: an outer joint member comprising a mouth section and a stem section; an inner joint member accommodated in the mouth section; and a plurality of torque transmitting members arranged between the outer joint member and the inner joint member; an outer joint member comprising a mouth section and a stem section; an inner joint member accommodated in the mouth section; and a plurality of torque transmitting members arranged between the outer joint member and the inner joint member; a bolt which is inserted from an outboard side through a bolt insertion hole formed in the hub wheel, and threadedly engaged and fastened into a bolt hole formed in an end portion of the stem section on the outboard side, so as to connect the bearing and the constant velocity universal joint to each other; convex portions, which extend in an axial direction, formed on any one of an outer peripheral surface of the stem section and an inner peripheral surface of the hub wheel; concave portions, which extend in the axial direction, formed on another one of the outer peripheral surface of the stem section and the inner peripheral surface of the hub wheel, the concave portions being fitted to the convex portions so as to allow torque transmission; and a guide portion formed on the outer peripheral surface of the stem section or the inner peripheral surface of the hub wheel, the guide portion is configured to guide start of fitting between the convex portions and the concave portions by being fitted to the stem section or the hub wheel with a gap.therebetween, wherein under a state in which an entire range of the guide portion is fitted to the stem section or the hub wheel with a gap therebetween and the convex portions and the concave portions do not fit to each other, a maximum inclination angle (θ 2) of the bolt with respect to the hub wheel is set to be larger than a maximum inclination angle (θ 1) of the outer joint member with respect to the hub wheel.