A cathode-side gas flow path of a cell that forms part of a fuel cell is formed by a first expanded metal (20) arranged on a gas inlet side, and a second expanded metal (22) arranged on a downstream side. The first expanded metal (20) is such that mesh is arranged in a straight line, and gas that flows on a gas diffusion layer side is separated from gas that flows on a separator side. The gas flowrate on the gas inlet side is reduced, so the amount of produced water that is carried away is reduced. As a result, the gas inlet side is inhibited from becoming dry at high temperatures.