A rotor includes a core and two or more ribs. The core has a through hole group that includes three or more through holes arranged in a circumferential direction. The through hole group is formed through a predetermined magnetic pole. The two or more ribs are configured as portions of the core, with each rib being interposed between adjacent through holes. A first of the ribs has a first inclination with respect to a magnetic pole centerline. A second of the ribs has a second inclination with respect to the magnetic pole centerline. The second inclination is larger than the first inclination. The magnetic pole centerline is a straight line that passes through a radial center line of the magnetic pole and an axial center of the rotor. The first rib is narrower than the second rib.