A semiconductor device includes a first semiconductor unit including a plurality of first semiconductor chips, an organic resin provided between the first semiconductor chips, a wiring layer provided above the first semiconductor chips to electrically connect the first semiconductor chips to each other, and a plurality of connecting terminals provided on an upper portion of the wiring layer and a second semiconductor unit fixed to a wiring layer side of the first semiconductor unit, the second semiconductor unit fixed to a region sandwiched between the connecting terminals, the second semiconductor unit having a second semiconductor chip, the second semiconductor unit electrically connected to the first semiconductor unit.