The hollow shaft motor according to the present invention comprises: a housing 11 having a cylindrical shape; an upper cover 12 coupled to an upper portion of the housing 11; a lower cover 15 coupled to a lower portion of the housing 11; a stator assembly 20 located in the housing 11; and a rotor assembly 30 located in the stator assembly 20 to rotate, comprising a hollow shaft 31, a rotor core 32 coupled to the hollow shaft 31, and a plurality of magnets 33 arranged on an outer circumferential surface of the rotor core 32 at a certain interval, wherein the hollow shaft 31 is manufactured with a plastic resin by an insert injection molding in the state where the rotor core 32 and the magnet 33 are located in an insert injection mold.