To provide a semiconductor device that can improve the characteristics.SOLUTION: According to an embodiment, a semiconductor device includes a semiconductor member, first and second electrodes, a gate electrode, a gate terminal, a first conductive member, a first terminal, and a first insulating member. The semiconductor member includes a first semiconductor region of the first conductive type, a second semiconductor region of the first conductive type, and a third semiconductor region of the second conductive type. The gate terminal is electrically connected to the gate electrode. The first conductive member is electrically insulated from the first electrode, the second electrode, and the gate electrode. The first terminal is electrically connected to the first conductive member. The first insulating member includes a first insulating region between the third semiconductor region and the gate electrode, and a second insulating region between the gate electrode and the first conductive member. A second signal that switches at a different timing from the first signal input to the gate terminal can be input to the first terminal.SELECTED DRAWING: Figure 1