A rotor includes: a shaft; a tubular rotor core; and a plurality of magnets. The shaft extends along a center axis. The rotor core surrounds the shaft. The plurality of magnets is disposed outside the rotor core in a radial direction and is aligned in a circumferential direction. A plurality of first recessed portions recessed outward in the radial direction is aligned in the circumferential direction in an inner surface of the rotor core in the radial direction. Each of the first recessed portions overlaps each of the magnets in the radial direction.