A switching regulator has: a switching device; a rectifying device having the anode thereof connected to an output terminal from which an output voltage is output; an inductor arranged between the switching device and the output terminal; a controller having an error amplifier configured to produce an error signal commensurate with a difference between a voltage commensurate with the cathode voltage of the rectifying device and a reference voltage, the controller using the cathode voltage of the rectifying device as a supply voltage and turning ON and OFF the switching device according to the cathode voltage of the rectifying device; a monitor configured to monitor a current that flows through the inductor; and a current varier configured to increase, based on the result of monitoring by the monitor, a current that flows through the rectifying device with increase in the current flowing through the inductor.