A switching regulator includes: a switching element that controlling supply of power supply voltage according to a control signal; a smoothing circuit smoothing the power supply voltage supplied via the switching element and supplying the smoothed power supply voltage as an output voltage to an output terminal; an error amplifier outputting an error signal according to a difference between the output voltage supplied to the output terminal and a reference voltage; a delta sigma modulation circuit generating a delta sigma modulation signal according to the error signal; and a power supply abnormality detection circuit outputting the delta sigma modulation signal as the control signal and detecting an abnormality in the power supply voltage based on the delta sigma modulation signal.