FUEL CELL SYSTEM

A fuel cell system comprises: a liquid storage section 1 for storing a reacting solution; a reacting section 2 for generating reacting gas from the reacting solution supplied from the liquid storage section 1; a gas storage section 3 for storing the reacting gas supplied from the reacting section 2; a fuel cell having an electrode which is arranged being joined to a solid high molecular electrolyte film, generating electricity while the reacting gas supplied from the gas storage section 3 is being used as fuel; and a reacting solution supply volume adjusting means for supplying the reacting solution from the liquid storage section 1 to the reacting section 2 in the case where the pressure in the liquid storage section 1 is higher than the pressure in the reacting section 2 and for stopping the supply of the reacting solution in the case where the pressure in the liquid storage section 1 is lower than the pressure in the reacting section 2. Therefore, a volume of supply of the reacting solution can be controlled in accordance with a state of driving the fuel cell.