Abstract: A power semiconductor device includes: a circuit body having a pair of conductor parts and a power semiconductor element sandwiched between the pair of conductor parts; a substrate in which a through hole is formed; and a sealing material that seals at least a part of each of the circuit body and the substrate, in which the circuit body is inserted into the through hole and has first and second exposed surfaces exposed from the sealing material, and the substrate has, in the through hole, a first protrusion and a second protrusion that protrude toward a center of the through hole and are connected to the circuit body, the first protrusion and the second protrusion being formed at positions opposed to each other in the through hole, and at least one of the first protrusion and the second protrusion being a terminal that transmits power to the power semiconductor element.