Patent ID: 8304132

Claim:
A fuel cell comprising a membrane electrode assembly including a plurality of unit cells which comprise: an electrolyte membrane; an anode including: anode catalyst layers arranged at intervals on a first surface of the electrolyte membrane, and anode gas diffusion layers stacked on the anode catalyst layers; and a cathode including: cathode catalyst layers arranged at intervals on a second surface of the electrolyte membrane and opposed to the anode catalyst layers, respectively, and cathode gas diffusion layers stacked on the cathode catalyst layers, wherein: a thickness of at least one of the anode catalyst layer and the cathode catalyst layer of one of the unit cells gradually decreases toward a neighboring unit cell, the anode catalyst layer includes: a bottom surface in contact with the electrolyte membrane, a top surface in contact with the anode gas diffusion layer, and a side surface connecting the bottom surface and the top surface, and an inclination angle between the bottom surface and the side surface is 30° or more and 80° or less.