According to one embodiment, a fuel cell includes an electromotive section, a fuel tank, an anode line through which a fuel is circulated between the electromotive section and the fuel tank, an air supply section, a cathode line which is connected to the electromotive section and through which products from the electromotive section are discharged, a cooler which is provided in the cathode line, cools the products, and condenses water, and an exhaust filter provided in the cathode line. The fuel cell has a reservoir portion which stores the condensed water and water discharged from the electromotive section, a first recovery line through which the water stored in the reservoir portion is guided into the fuel tank, and a second recovery line through which the water produced in the cathode line is guided into the reservoir portion between the cooler and the exhaust filter.