Semiconductor device 10 includes wiring substrate 11 including wiring 14 and wiring 15 in predetermined patterns, semiconductor chips 19 and 23 which are mounted on wiring substrate 11 with electrodes electrically connected to wiring 14 of wiring substrate 11 via wires 21 and 24, first sealing body 25 made of an insulative resin which is formed on a part of wiring substrate 11 and which covers semiconductor chips 19 and 23 and wires 21 and 24, a plurality of connecting connection pads 27 provided on the top surface of first sealing body 25, a plurality of connecting wires 26 which extend from the surface of wiring substrate 11, on which semiconductor chips 19 and 23 are mounted, to the top surface of first sealing body 25 via the side surfaces of first sealing body 25, and which electrically connect wiring 14 of wiring substrate 11 and the plurality of connecting connection pads 27 and second sealing body 28 made of an insulative resin which covers the plurality of connecting wires 26.