To provide a voltage regulator capable of securely being turned off even if the regulator is used under a high temperature and an impedance of an external load is large. A voltage regulator is provided, which includes a voltage divider circuit that can divide a potential difference between an output voltage terminal and a reference terminal, wherein when the voltage divider circuit inputs an on signal, the voltage divider circuit outputs a constant voltage between the output voltage terminal and the reference terminal, and wherein when the voltage divider circuit inputs an OFF signal, the voltage divider circuit can reduce the impedance thereof.