A fuel cell has an anode electrode (3), a cathode electrode (5), the membrane electrolyte (4) sandwiched by the anode and cathode electrodes, two separators (1, 7), a first current collector (2) and a second current collector (6). The two separators (1, 7) each having a flat plate-shaped porous body are disposed to sandwich the two electrodes. The two separators are water permeable. The first current collector (2) is disposed between the anode electrode and one separator, the first current collector forming a first gas channel allowing flow of the fuel gas. The second current collector (6) is disposed between the cathode electrode and the other separator, the second current collector forming a second gas channel allowing flow of the gaseous oxidant.