A semiconductor package includes a wiring board and a semiconductor device mounted on the wiring board. At least one penetration hole extends from one surface of the semiconductor chip to an opposite surface of the semiconductor chip. A penetration electrode is situated inside the penetration hole without contacting a wall of the penetration hole. The penetration electrode has one end fixed to the one surface of the semiconductor chip and an opposite end protruding from the opposite surface of the semiconductor chip. A connection terminal is formed on the opposite end of the penetration electrode and electrically connected to the wiring board.