Patent ID: 7759014

Claim:
A fuel cell formed by stacking a membrane electrode assembly between a pair of first and second metal separators in a stacking direction, said membrane electrode assembly including first and second electrodes and an electrolyte interposed between said first and second electrodes, the surface area of said second electrode being larger than the surface area of said first electrode, a reactant gas passage for at least one reactant gas extending through said fuel cell in the stacking direction, wherein said first metal separator comprises: a reactant gas flow field formed on a first surface of said first metal separator facing said first electrode for supplying said reactant gas to said first electrode; and a through hole for allowing said reactant gas supplied from said reactant gas passage into a second surface of said first metal separator to move toward said first surface to supply said reactant gas to said reactant gas flow field; and wherein: a seal member is formed integrally with said first metal separator, the seal member is made of a material different than a metal material of the first metal separator, said seal member includes a plurality of flow grooves for guiding said reactant gas from said through hole toward said reactant gas flow field and a plurality of receivers which directly contact said first electrode, and said flow grooves and said receivers are alternately arranged.