Abstract: A reference potential generator for maintaining a regulated potential even when a power supply potential decreases. When the power supply potential decreases and a potential difference between the power supply potential and a potential at a node of a first circuit becomes lower than a threshold value of an inverter transistor, the inverter transistor is deactivated. This decreases a gate potential of a transistor, which is connected to the inverter transistor, to the ground potential and activates the transistor. In this manner, current is supplied from the power supply potential to a node of a second circuit through the transistor. As a result, the potential (reference potential) at a node of the second circuit increases. This prevents the reference potential from being decreased.