FUEL CELL SEPARATOR AND SINGLE FUEL CELL

A fuel cell separator includes ribs. The fuel cell separator has a plurality of gas flow paths separated from each other by the ribs. The fuel cell separator has, on a surface of the ribs on the gas flow path side, a liquid water flow path provided separately from the gas flow paths along the gas flow paths. The liquid water flow path has an expanded region in which a cross-sectional area of the liquid water flow path in a direction perpendicular to a flow direction of the liquid water flow path is larger than a cross-sectional area of the liquid water flow path in the direction perpendicular to the flow direction in a remaining region of the liquid water flow path.