Fuel Generation Device and Fuel Cell System Provided with Same

A fuel generating device which generates fuel gas as a reductant gas through an oxidation reaction with an oxidant gas, the device comprising:

• a gas inflow port through which the oxidant gas is supplied from outside;
• a gas outflow port through which the fuel gas is supplied to outside;
• a fuel generating member which contains metal fine particles and which generates the fuel gas through the oxidation reaction of the metal fine particles with the oxidant gas;
• a housing which is provided between the gas inflow port and the gas outflow port and which houses the fuel generating member;
• an exhaust valve which is provided between the housing and the gas outflow port;
• and
• a gas diffuser which is provided between the exhaust valve and the gas outflow port,
• wherein
• a degree of opening of the exhaust valve is varied periodically among at least two different degrees of opening including a first degree of opening and a second degree of opening smaller than the first degree of opening such that
• a rise in pressure inside the housing due to the oxidant gas being supplied to the housing via the gas inflow port from outside is larger when the exhaust valve has the second degree of opening than when the exhaust valve has the first degree of opening.