A semiconductor device may include first and second conductor plates opposed to each other via first and second semiconductor chips, a first conductor spacer interposed between the first semiconductor chip and the second conductor plate, a second conductor spacer interposed between the second semiconductor chip and the second conductor plate, and an encapsulant provided between the first and second conductor plates. A lower surface of the second conductor plate may include a first joint area where the first conductor spacer is joined, a second joint area where the second conductor spacer is joined, an adhesion area to which the encapsulant adheres, and a separation area from which the encapsulant is separated. The adhesion area may surround the first joint area, the second joint area, and the separation area. The separation area may be located between the first and the second joint areas.