One embodiment of a motor unit according to the present invention comprises a motor that drives a vehicle, a battery that supplies electrical power to the motor, a chiller that extracts heat from a refrigerant, and a cooling circuit through which the refrigerant flows. The cooling circuit includes a first loop in which the refrigerant is circulated through the motor and the chiller, a second loop through which the refrigerant is circulated through the battery and the chiller, a first bypass that bypasses the chiller in the first loop, and a second bypass that bypasses the chiller in the second loop. In the first loop, heat generated by the motor can be recovered. In the second loop, heat generated by the battery can be recovered.