A set of electrodes comprising the following: a plurality of first electrodes, each of which comprises a sheet-shaped first collector and a first active material supported on said first collector; a plurality of second electrodes, each of which comprises a sheet-shaped second collector and a second active material supported on said second collector; and sheet-shaped separators interposed between the first electrodes and the second electrodes. The first electrodes and the second electrodes are stacked in an alternating manner with the separators sandwiched therebetween, and each first collector contains a first porous metal body.