NOVELTY - The cell has a power generating body including an electrolyte membrane. A separator (30) is provided along the power generating body. To-be-supplied fluid flows by using the cell through a flow path. A first seal portion (70) surrounds the flow path in a surface (30a) of the separator and inhibits the fluid from flowing out of the cell. An electrolytic corrosion inhibiting portion is provided between the flow path and the first seal portion. A second seal portion (71) is formed in the inhibiting portion. An extended portion (73) is provided in different positions of the second seal portion.    USE - Fuel cell for being mounted in a vehicle for generating power by causing an electrochemical reaction using reaction gases e.g. fuel gas and oxidant gas.    ADVANTAGE - The electrolytic corrosion inhibiting portion is provided at a lower side of the seal portion along a gravitational direction of the manifold, thus reducing utilization rate of material for forming the electrolytic corrosion inhibiting portion. The cell ensures that distance from the manifold to the seal portion increases due to an extended portion, so that electrical resistance of a circuit through which current causing electrolytic corrosion flows is increased, thus effectively inhibiting electrolytic corrosion by providing the extended portion even at a portion, where the seal portion is not formed. The extended portion can be formed on the separator to be sandwiched with the power generating body, so that weight of the fuel cell is inhibited. The cell ensures that height of a second seal portion is lower than height of the first seal portion, so that rattling is inhibited when the seal portions are in contact with the separator, thus serving the second seal portion as a sizing portion, and hence improving sealing performance of the seal portions. The electrolyte membrane is a solid polymer membrane to be made of fluorine resin material or hydrocarbon resin material, so that the electrolyte membrane provides better proton conductivity in a wet state. The cell is simple in structure and small in size, and has low production cost, and saves resources consumption.    DESCRIPTION OF DRAWING(S) - The drawing shows a front view of a separator.    Separator (30)    Surface of the separator (30a)    Seal portions (70, 71)    Extended portion (73)    Oxidant gas supply manifold (152)