FUEL CELL

PROBLEM TO BE SOLVED: To provide a fuel cell improved in battery performance in regard to a fuel cell alternately having comb-shaped branch flow passages blocked in a flow passage end thereof.SOLUTION: A single cell structuring the fuel cell alternately includes a gas inflow passage 48in divided in a comb shape from a side of an air supply manifold and blocked in a flow passage end thereof, and a gas outflow passage 48out divided in a comb shape from a side of an air discharge manifold and blocked in a flow passage end thereof with a rib between flow passages therebetween in a gas separator 26 on a side of a cathode. The air flowing into the gas inflow passage 48in enters the adjacent gas outflow passage 48out, getting into a gas diffusion layer in a range in which the rib between flow passages abuts thereon over the width of the rib, and is diffused in the gas diffusion layer. The width of the rib and permeability of the gas in the gas diffusion layer are regulated to restrict unevenness when the air passes through the gas diffusion layer in a range in which the rib abuts thereon.