FUEL CELL AND POWER GENERATING METHOD

A fuel cell which exhausts a small amount of hydrogen gas, does not easily pose problems with exhaust gas treatment and gas discharging, and can generate power constantly, continuously and efficiently, and a power generating method using it. The fuel cell is provided with single or a plurality of unit cells UC each comprising a platy solid polyelectrolyte (1), a cathode-side electrode plate (2), an anode-side electrode plate (3), an oxygen-containing gas supply unit for supplying oxygen-containing gas to the cathode-side electrode plate (2), and a hydrogen gas flow path unit for supplying hydrogen gas to the anode-side electrode plate (3), wherein, for the above unit cell UC constituting the final stage of hydrogen gas supply, the flow sectional area of the hydrogen gas flow path unit is set to up to 1% of the area of the above anode-side electrode plate (3), and an exhaust control mechanism (10) for exhausting a gas amounting to 0.02-4 vol.% of hydrogen gas supplied to a unit cell UC is provided at the exhaust outlet of the hydrogen gas flow path unit.