FUEL CELL STACK

A fuel cell stack comprising stacked unit cells, each comprising a membrane electrode assembly comprising an electrolyte membrane and a pair of electrodes disposed on both surfaces thereof, two separators sandwiching the membrane electrode assembly, and a frame-shaped resin sheet disposed between the two separators and around the membrane electrode assembly to attach the separators, wherein the resin sheet comprises a first protrusion protruding in the planar direction of the resin sheet and occupying a part of a first region occupied by a reaction gas inlet manifold, and a second protrusion protruding in the planar direction of the resin sheet and occupying a part of a second region occupied by a reaction gas outlet manifold; and wherein the resin sheet comprises at least one water discharge hole at a predetermined position of at least one protrusion selected from the group consisting of the first protrusion and the second protrusion.