FUEL-CELL SYSTEM

A fuel cell system includes: a fuel cell; a reformer configured to reform an electric power generation raw material to generate a hydrogen-containing gas and supply the hydrogen-containing gas to an anode of the fuel cell; an electric power generation raw material supply unit configured to supply the electric power generation raw material to the reformer; a reforming material supply unit configured to supply at least one of reforming water and reforming air, utilized in a reforming reaction, to the reformer; an oxidizing gas supply unit configured to supply an oxidizing gas to a cathode of the fuel cell; a combustor including an ignitor configured to ignite an exhaust gas discharged from the fuel cell; and a controller. In an operation stop process of the fuel cell system, the controller causes the oxidizing gas supply unit to supply the oxidizing gas to the cathode of the fuel cell, causes the electric power generation raw material supply unit and the reforming material supply unit to intermittently supply the electric power generation raw material and at least one of the water and the air to the reformer, and causes the ignitor of the combustor to perform an ignition operation.