A reference voltage generating circuit is provided that includes: a differential amplifier amplifying an input signal and generate a reference voltage; an output amplifier amplifying the reference voltage and outputting the amplified reference voltage; and a startup circuit connected between an output terminal of the differential amplifier and an input terminal of the output amplifier. The startup circuit has a first switch and a second switch. The first switch connects the output terminal of the differential amplifier and the input terminal of the output amplifier according to a voltage of an output terminal of the output amplifier. The second switch connects the input terminal and the output terminal of the output amplifier according to a voltage of the output terminal of the differential amplifier.