A power supply control device that includes a controller configured to switch on and off a first semiconductor switch and a plurality of second semiconductor switches whose current input terminals are connected to a current output terminal of the first semiconductor switch, the controller being configured to control supply of power via the plurality of second semiconductor switches by switching; a first parasitic diode connected between a current input terminal and the current output terminal of the first semiconductor switch; and a plurality of second parasitic diodes that are respectively connected between the current input terminals and current output terminals of the plurality of second semiconductor switches.