Fuel cell system, and fuel cell module

A fuel cell module, comprising:

• a cell stack comprising stacked fuel cells, wherein the cell stack generates electric power using hydrogen-containing gas and oxygen-containing gas that are supplied;
• a combustion part that combusts the hydrogen-containing gas and the oxygen-containing gas that have not been consumed at the cell stack;
• a reformed water carburetor that is in communication with the combustion part via an exhaust gas passage and generates steam using water supplied by heat exchange with gas supplied through the exhaust gas passage;
• a gas mixer that is in communication with the reformed water carburetor via a reformed steam pipe and generates mixed gas in which fuel gas that is supplied and the steam supplied through the reformed steam pipe are mixed;
• and
• a reformer that is in communication with the gas mixer, generates the hydrogen-containing gas by reforming the mixed gas, and supplies the hydrogen-containing gas to the cell stack via the hydrogen-containing gas passage,
• wherein the gas mixer and the reformer are provided in the exhaust gas passage and the reformed steam pipe is provided in the exhaust gas passage along the exhaust gas passage from the gas mixer that is downstream of the gas with respect to the reformer.