A disclosed invention is an internal power supply circuit, which generates an internal power supply from a first power supply. The circuit comprises a first internal step-down power supply generation unit, which generates a first internal step-down power supply from the first power supply; a normal second internal step-down power supply generation unit, which generates a second internal step-down power supply from the first internal step-down power supply in the normal operating state, and which, at the time of power supply startup, begins operation to generate the second internal step-down power supply at a first timing at which a voltage of the first internal step-down power supply reaches a prescribed reference level; and, a startup power supply load unit, which begins to consume, before the first time, current from the first internal step-down power supply.