A power supply control apparatus according to the embodiment includes a microcomputer. The microcomputer is configured to: acquire switching information for switching a power supply pathway supplying power to a load between (i) a first pathway supplying power from a first battery to the load and (ii) a second pathway supplying power from a second battery to the load. When the microcomputer switches the power supply pathway between the first pathway and the second pathway, the microcomputer activates or deactivates a voltage converter while turning off a semiconductor relay so that power is supplied to the load through the first pathway via a body diode during a time period in which the voltage converter completes an activation process or a deactivation process.