The semiconductor device includes: a transistor, and a body diode included in the transistor so that the body diode is anti-parallel to the transistor, and a diode anti-parallel connected to the bidirectional current-conduction device, wherein the bidirectional current-conduction device allows a first current and a second current to flow, and allows at least the second current to switch between conduction and non-conduction, the first current flowing in a first direction from a first main electrode of the transistor to a second main electrode facing the first main electrode, the second current flowing through the body diode in a second direction opposite to the first direction, and the diode is smaller in area than the bidirectional current-conduction device in a plan view.