Abstract: A semiconductor device includes a base body, a semiconductor chip deposited on a top surface of the base body, an encapsulating resin covering the base body and the semiconductor chip, a ring-shaped plug, and at least one stand-up terminal. The ring-shaped plug has an insulating property, is buried in a part of an upper part of the encapsulating resin while being aligned with respect to the base body, and has a top surface exposed to an outside of the encapsulating resin. The at least one stand-up terminal includes a vertical part penetrating the ring-shaped plug and extending in a direction perpendicular to the top surface of the base body, and has a lower end electrically connected to an electrode of the semiconductor chip inside the encapsulating resin and an upper end exposed to the outside of the encapsulating resin. The ring-shaped plug is fixed and bonded to a circumference of a side surface of the vertical part of the stand-up terminal.