A semiconductor device in which a chip is embedded in a wiring board and bump electrodes formed over the front surface of the semiconductor chip are flip-chip coupled to wiring formed in the wiring board and the entire back surface of the semiconductor chip functions well as a back electrode and a method of manufacturing the semiconductor device. A semiconductor chip is embedded inside a wiring board. The semiconductor chip is flip-chip coupled (face down) to a base substrate as the core layer of the wiring board through bump electrodes. A conductive film is formed over the semiconductor chip's surface reverse to the surface over which bump electrodes are formed. The conductive film functions as a back electrode which supplies a reference voltage to the integrated circuit in the semiconductor chip. The conductive film is electrically coupled to third-layer wiring through vias.