A switching regulator is disclosed that uses a non-linear amplifier and is capable of PWM control operation at high frequencies with a simple circuit configuration and without increasing current consumption. The switching regulator includes a switching unit, an inductor, a rectification unit, and a control circuit that controls the switching of the switching unit so that the output voltage of the switching regulator becomes a constant voltage. The control circuit uses a pulse signal to perform PWM control on the switching unit. The pulse signal is generated by amplifying an error voltage between the output voltage and a reference voltage at a gain variable in response to a voltage of a saw-tooth waveform signal.