This power device (1) for vehicles is provided with: a bearing (2) for a wheel, the bearing (2) having a stationary ring (4) and a rotating ring (5) which has a hub flange (7), is rotatably supported by the stationary ring with rolling bodies (6) therebetween, and has, mounted on the hub flange (7), a wheel of a vehicle and a brake rotor (12); and a generator (3) having a stator (18) which is mounted to the stationary ring (4) of the bearing (2), and a rotor (19) which is mounted to the rotating ring (5) of the bearing (2). The rotor (19) has a soft magnetic material section (31), a magnet (32), and a resin material section (33) which is formed integrally with the soft magnetic material section and the magnet.