A semiconductor device includes a first interlayer film formed on an upper surface of a substrate, a first metal wiring line, a second interlayer film, a second metal wiring line, a first via electrically connecting the first metal wiring line and the second metal wiring line, a landing pad embedded in an upper portion of the first interlayer film and penetrating the second interlayer film, and a second via penetrating the substrate and the first interlayer film from a back side of the substrate and connected to the landing pad. The lower surface position of the landing pad is different from that of the first metal wiring line.