A voltage generating circuit includes a first resistance voltage dividing circuit, configured by low temperature coefficient resistors being connected in series, that generates a reference voltage by resistance-dividing a predetermined power supply voltage, one or a multiple of a second resistance voltage dividing circuit, configured by a resistor having a positive or negative resistance temperature coefficient and the low temperature coefficient resistor being connected in series, that generates a temperature-dependent divided voltage by resistance-dividing the power supply voltage, and an instrumentation amplifier that generates the comparison reference voltage in accordance with a difference between the reference voltage and the divided voltage. Furthermore, the voltage generating circuit includes a comparator that, when a divided voltage exceeds a predetermined voltage threshold in accompaniment to a temperature rise, changes the divided voltage generated by the second resistance voltage dividing circuit and applied to the instrumentation amplifier, or changes a gain of the instrumentation amplifier.