A reference voltage generator generates a reference voltage that is less dependent on temperature and can adjust the dependence of the reference voltage on temperature and the reference voltage at the same time independently of each other. The reference voltage generator including a preliminary reference voltage generation unit which generates a preliminary reference voltage which is inversely proportional to temperature and a reference voltage generation unit which generates a reference voltage by dividing the preliminary reference voltage. The reference voltage generation unit includes: at least one resistor which is connected between the preliminary reference voltage and the reference voltage; at least one transistor which is connected between the reference voltage and an internal node; and at least one second resistor which is connected between the internal node and a ground. The preliminary reference voltage or a power supply voltage is applied to at least one gate of the transistor. At least one transistor is an NMOS transistor.