Patent ID: 7648791

Claim:
A fuel cell comprising a unit cell component, wherein: in the unit cell component including separators, a membrane electrode assembly, in which a pair of electrodes are provided on either side of an electrolyte membrane, is provided between each separator and the separator adjacent thereto; pin insertion holes are respectively provided in a plurality of portions in an outer periphery of each of the separators, and the pin insertion holes of the separators are respectively coaxial with each other; a leg portion of a cell fastening pin made of resin is inserted through each set of the coaxial pin insertion holes of the separators; the unit cell component is fastened by fitting a flange portion formed at an end of the leg portion to one of the outermost separators, and fitting a hook portion formed at the other end of the leg portion to the other of the outermost separators; the fuel cell has a pair of the unit cell components which are stacked, where the cell fastening pins mounted into one of the unit cell components are arranged at positions different from positions where the cell fastening pins mounted into the other unit cell component are arranged; the pin insertion holes of said one of the outermost separators have diameters larger than diameters of the corresponding pin insertion holes of the other of the outermost separators; and the leg portion of each cell fastening pin has a larger-diameter portion having a larger diameter than a remaining portion, where the larger-diameter portion is formed next to the flange portion and is contained in the corresponding pin insertion hole of said one of the outermost separators, through which the cell fastening pin is inserted.