<p>A fuel cell includes a proton conductive film (6), an anode catalyst layer (3) formed on one (first) side of the proton conductive film (6), and a cathode catalyst layer (2) partially formed on the opposite (second) side of the proton conductive film (6). Water generated by the cathode catalyst layer (2) is supplied via the proton conductive film (6) to the anode catalyst layer (3). A water diffusion region (2a) is formed in contact with the cathode catalyst layer (2) on the second side of the proton conductive film (6).</p>
