The present invention may provide a motor including a housing, a stator disposed inside the housing, a rotor disposed inside the stator, and a shaft coupled to the rotor, wherein the rotor includes a rotor core and magnets including a plurality of unit magnets coupled to an outer circumferential surface of the rotor core, the rotor core includes grooves disposed at a boundary between an inner circumferential surface and an upper surface of the rotor core, the shaft includes a first body, a plurality of blades extending outward from an upper surface of the first body, and a protrusion extending downward from a lower surface of the first body, and a side edge of the blade is positioned at a lateral center of the unit magnet when the protrusion is disposed in the groove.