DC power supply system

A plurality of DC power supply apparatuses which are CVCC power supplies have output sides connected in parallel to a load. In each of the plurality of DC power supply apparatuses, an upper limit current maintained in a CC mode is designed to be equal to or lower than a rated current. Reference voltages of the plurality of DC power supply apparatuses are set to different values. The plurality of DC power supply apparatuses supply currents with transition from a CV mode to a CC mode, in the descending order of magnitude of the reference voltages, in correspondence with output currents to the load.