A power supply circuit includes a first switch, a voltage regulator circuit connected to the first switch, and a control circuit for controlling the first switch. The control circuit includes a second switch, a third switch, and a voltage generation circuit. For controlling the first switch, first voltage output from the voltage generation circuit is applied to the first switch through the second switch, and second voltage output from the voltage generation circuit is applied to the first switch through the third switch. Power consumption of the power supply circuit can be reduced.