A semiconductor device has a substrate and an electrode layer formed on the substrate, and the electrode layer includes a plurality of conductive layers and an insulating layer which are stacked, the insulating layer being interposed between two of the conductive layers adjacent each other, a through-hole being formed in each of the conductive layers lower than an uppermost conductive layer among the conductive layers, and the through-hole being filled with an insulating material.
The layout density of the through electrodes in the horizontal plane of the substrate is enhanced. Through holes 103 extending through the silicon substrate 101 is provided. An insulating film 105 is buried within the through hole 103. A plurality of columnar through plugs 107 are provided in the insulating film 105.
