A power supply control system includes a power supply circuit that supplies power, an electronic component that is operable by the power supplied from the power supply circuit, starts shutdown processing in response to an input of a stop instruction signal, and operates when an operation instruction signal is input, and a signal control circuit that receives a power input state signal or a power cutoff state signal as a power state signal indicating a state of the power supply circuit, outputs the stop instruction signal when the power cutoff state signal is input, outputs the operation instruction signal when the power input state signal is input, and outputs the stop instruction signal at least during the shutdown processing when the power input state signal is input in a case in which the shutdown processing of the electronic component is not finished.
