The invention relates to a fuel cell stack structure capable of suppressing a drop in voltage resulting from flooding or contamination at an end in a direction in which cells are laminated, particularly in a cell at a gas outlet/inlet end. In this fuel cell stack structure, a layer which is irrelevant to power generation and in which a gas flow channel is formed is provided at least at a gas outlet/inlet end of a laminated-cell body of a fuel cell such as a solid-polyelectrolyte fuel cell. The layer is constructed of a dummy cell having a gas flow channel but no MEA. In addition, according to this fuel cell stack structure, both a fuel gas flow channel and an oxidative gas flow channel are formed in one face of the layer which is irrelevant to power generation and in which the gas flow channels are formed.