| 主权项 |
1. A fuel cell formed by stacking a membrane electrode assembly and separators, the membrane electrode assembly including electrodes and an electrolyte membrane interposed between the electrodes, one of the separators having a reactant gas flow field for allowing a fuel gas or an oxygen-containing gas as one of reactant gases to flow along a separator surface in one direction and a reactant gas passage connected to the reactant gas flow field for allowing the one of the reactant gases to flow in the stacking direction of the separators;
wherein the reactant gas passage has a rectangular shape extending in a flow field width direction intersecting with a flow direction in the reactant gas flow field; and in the reactant gas passage, a width of an opening on a short side is increased from an end side to a central side in the flow field width direction. |
