A stack structure in which a plurality of fuel cells, which comprise an electrolyte layer and an air electrode layer and a fuel electrode layer on each of both surfaces of the electrolyte layer, for generating electricity are stacked, comprises: at least one interconnector; at least one frame; and at least one combined function portion. The interconnector comprises a center area which supports each of the fuel cells from between the plurality of fuel cells and which is electrically connected, and edge areas which extend from the end portion of the fuel cells. The frame is arranged so as to support the side portion of the fuel cells from the edge areas so as to reinforce the strength of the fuel cells that are supported by the interconnector. The combined function portion is arranged on either the interconnector or the frame, in an area to which air or fuel gas is supplied or discharged on each of the air electrode layer and the fuel electrode layer in the fuel cells which is within the edge areas, so as to maintain a constant distance between the interconnector and the frame.