Abstract: A semiconductor device according to the present embodiment includes a plurality of stacked first semiconductor chips. First columnar electrodes are connected to electrode pads of the first semiconductor chips and extend in a stacking direction of the first semiconductor chips. A plurality of second semiconductor chips are stacked above the first semiconductor chips. Second columnar electrodes are connected to electrode pads of the second semiconductor chips and extend in a stacking direction of the second semiconductor chips. Third columnar electrodes are respectively connected to tops of the first columnar electrodes and extend in the stacking direction of the second semiconductor chips. A resin layer covers the first semiconductor chips, the second semiconductor chips, the second columnar electrodes, and the third columnar electrodes and exposes tops of the second and third columnar electrodes.