To provide a fuel cell in which reduction in power generating efficiency due to the drying of an electrolyte film is reduced.

In the fuel cell 1 in which power generation is made because a hydrogen ion moves between polyelectrolyte films 3 pinched by electrodes 2, a plurality of reaction gas flow paths 5 in which the reaction gas is circulated along the electrodes 2 is formed so that pressure temporarily rises in the vicinity of the upstream end of an effective power generation range 15 of the electrodes 2. Here, a member 10 to reduce a flow path sectional area is provided in the vicinity of the upstream end of the effective power generation range 15 of the electrodes 2.

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