Provided is an electric double-layer capacitor and the like, which may be easily manufactured. In a recessed container (2) constituting a package of an electric double-layer capacitor (1), a step portion (4) is formed. With this, the recessed container (2) has two parallel bottom surfaces which are not provided in the same plane, that is, a first bottom surface constituting a bottom portion of a recessed portion (13) and a second bottom surface constituting an upper surface of the step portion (4). The first bottom surface and the second bottom surface respectively have metallic layers (11, 9) formed thereon, which pass through the recessed container (2) toward an outside to respectively connect to terminals (12, 10). Electrodes (6, 5) are respectively connected to the upper surfaces of the metallic layers (11, 9).