A power supply control apparatus in a power supply system comprising a power supply unit, a main power supply, and a backup power supply, the power supply control apparatus connecting the power supply unit, the main power supply, and the backup power supply and controls charging and discharging of the backup power supply, the power supply control apparatus comprising: a power line to which the power supply unit, the main power supply, the backup power supply, and a backup load are connected; a first switch provided on the power line and configured to turn on and off connection between the power supply unit as well as the main power supply and the backup power supply; a second switch provided on the power line and configured to turn on and off connection between the backup power supply and the backup load; a charging DC/DC converter connected to the power line in parallel with the second switch and configured to convert a voltage supplied from a power supply unit side and supply a converted voltage to a backup power supply side; and a control unit configured to execute: discharge control of turning off the first switch and turning on the second switch to discharge electric power from the backup power supply to the backup load; first charge control of turning on the first switch and turning off the second switch to charge the backup power supply via the charging DC/DC converter; and second charge control of turning on the first switch and turning on the second switch to charge the backup power supply via the second switch, wherein in charging the backup power supply, the control unit is configured to execute the second charge control only in a case in which a current value of a charging current is equal to or greater than a first predetermined value and equal to or less than a second predetermined value that is greater than the first predetermined value. a power line to which the power supply unit, the main power supply, the backup power supply, and a backup load are connected; a first switch provided on the power line and configured to turn on and off connection between the power supply unit as well as the main power supply and the backup power supply; a second switch provided on the power line and configured to turn on and off connection between the backup power supply and the backup load; a charging DC/DC converter connected to the power line in parallel with the second switch and configured to convert a voltage supplied from a power supply unit side and supply a converted voltage to a backup power supply side; and a control unit configured to execute: discharge control of turning off the first switch and turning on the second switch to discharge electric power from the backup power supply to the backup load; first charge control of turning on the first switch and turning off the second switch to charge the backup power supply via the charging DC/DC converter; and second charge control of turning on the first switch and turning on the second switch to charge the backup power supply via the second switch, discharge control of turning off the first switch and turning on the second switch to discharge electric power from the backup power supply to the backup load; first charge control of turning on the first switch and turning off the second switch to charge the backup power supply via the charging DC/DC converter; and second charge control of turning on the first switch and turning on the second switch to charge the backup power supply via the second switch, wherein in charging the backup power supply, the control unit is configured to execute the second charge control only in a case in which a current value of a charging current is equal to or greater than a first predetermined value and equal to or less than a second predetermined value that is greater than the first predetermined value. <EOS>