A power supply system includes a plurality of power supply units that each includes an output terminal connected each other in parallel to other output terminals each included in other power supply units and connected to a plurality of load units, a power supply section that inputs an input voltage and outputs a first output voltage from the output terminal to the plurality of load units, and a shut-off control section that shuts off the output of the first output voltage from the output terminal based on an inputted stand-by signal, and a management control unit that inputs a configuration information representing a configuration of each of the plurality of load units in which the first voltage is inputted, and outputs the stand-by signal to any of the plurality of power supply units based on the configuration information.