A semiconductor device includes first to fifth terminals, an amplification circuit including a first input end connectable to the first terminal and the third terminal, a second input end connectable to the second terminal and the fourth terminal, and an output end, and a switching circuit. The switching circuit is configured to switch between a first state in which the first input end is connected to the first terminal and insulated from the third terminal and the second input end is connected to the second terminal and insulated from the fourth terminal, and a second state in which the first input end is connected to the third terminal and insulated from the first terminal and the second input end is connected to the fourth terminal and insulated from the second terminal.