A semiconductor device including a semiconductor chip encapsulated by an encapsulation resin and a manufacturing method thereof, in which a size reduction may be attempted. The device includes a semiconductor chip, an external connection terminal pad electrically connected to the semiconductor chip, and an encapsulation resin encapsulating the semiconductor chip, wherein a wiring pattern on which the external connection terminal pad is formed is provided between the semiconductor chip and the external connection terminal pad, and the semiconductor chip is flip-chip bonded to the wiring pattern.