A method for manufacturing a rotor includes filling magnet housing holes, which accommodate magnets, with plastic that has been heated to a specified temperature to be molten, thereby heating a rotor core with heat of the plastic, arranging an end plate on one end face in the axial direction of the rotor core, thereby heating the end plate with heat of the heated rotor core, and welding the end plate to the rotor core. The welding the end plate includes welding the end plate to the rotor core in a state in which, during decrease of temperatures of the rotor core and the end plate, the temperatures of the rotor core and the end plate are lower than the specified temperature and within an operational temperature range for use of the rotor.