A semiconductor device includes a first lead with a first block, a second lead with a second block, and a sealing resin partially covering the first and second leads. The first block is exposed from the sealing resin and has a first covered surface covered with an electroconductive layer, and a pair of first exposed surfaces spaced apart from each other via a part of the first covered surface. The second block is exposed from the sealing resin and has a second covered surface covered with an electroconductive layer, and a pair of second exposed surfaces spaced apart from each other via a part of the first covered surface.