According to one embodiment, a semiconductor device includes a first transistor, a first circuit, a second circuit, and a third circuit. The first transistor has one end connected to a power supply voltage terminal, the other end connected to a first node, and a gate connected to a first output terminal. The first circuit is configured to control a voltage of the first node based on a voltage of a ground voltage terminal. The second circuit is configured to control a voltage of the first output terminal based on the voltage of the ground voltage terminal and a voltage of an input terminal. The third circuit is configured to control switching between connection and disconnection between the ground voltage terminal and the first circuit.