SOLID-STATE OXIDE FUEL CELL

To provide a solid oxide fuel cell system with which the durable lifespan of the reformer can be extended by suppressing temperature unevenness in the reformer. The present invention is a solid oxide fuel cell (1), including a fuel cell module (2), a reformer (2) for producing hydrogen by POX, ATR, and SR steps; a fuel supply apparatus (38), a reform air supply apparatus (44), a water supply apparatus (28), a generating air supply apparatus (45), and a control device (110) which, as the temperature inside the fuel cell module rises, executes in sequence POX, ATR and SR steps at predetermined respective temperature bands, and causes a rise in temperature at which electrical generation is possible; wherein the control device comprises a localized temperature rise suppression circuit (110a) which, by causing steam reforming to occur locally within the reformer in the POX step, suppresses localized temperature rises in the reformer.