A fuel cell apparatus, comprising: a fuel cell module; a heat exchanger which carries out heat exchange between exhaust gas from the fuel cell module and a medium; a circulation line connected to the heat exchanger, the circulation line allowing the medium to circulate the heat exchanger; a heat dissipator located in the circulation line, the heat dissipator cooling the medium flowing through the heat exchanger; and an exterior case which houses the fuel cell module, the heat exchanger, the heat dissipator, and at least part of the circulation line, the heat dissipator provided with two openings, the heat dissipator comprising at least a duct which defines an air flow channel between the two openings (81a, 83a); a fan located closer to one opening of the two openings (81a, 83a) than the other opening in the air flow channel, the fan producing flowing air; and a radiator located closer to the other opening of the two openings (81a, 83a) than the one opening in the air flow channel, the radiator carrying out heat exchange between the medium and air flowing through an interior of the air flow channel, the exterior case provided with two ventilation holes to which the two openings (81a, 83a) are connected directly or via an air passageway, respectively, the duct comprising a plurality of separable parts; wherein the plurality of separable parts of the duct include at least a first duct (59A1) located close to the one opening; and wherein the plurality of separable parts of the duct include, in addition to the first duct (59A1), an upper duct and a lower duct which are vertically separable from each other. a fuel cell module; a heat exchanger which carries out heat exchange between exhaust gas from the fuel cell module and a medium; a circulation line connected to the heat exchanger, the circulation line allowing the medium to circulate the heat exchanger; a heat dissipator located in the circulation line, the heat dissipator cooling the medium flowing through the heat exchanger; and an exterior case which houses the fuel cell module, the heat exchanger, the heat dissipator, and at least part of the circulation line, the heat dissipator provided with two openings, the heat dissipator comprising at least a duct which defines an air flow channel between the two openings (81a, 83a); a fan located closer to one opening of the two openings (81a, 83a) than the other opening in the air flow channel, the fan producing flowing air; and a radiator located closer to the other opening of the two openings (81a, 83a) than the one opening in the air flow channel, the radiator carrying out heat exchange between the medium and air flowing through an interior of the air flow channel, a duct which defines an air flow channel between the two openings (81a, 83a); a fan located closer to one opening of the two openings (81a, 83a) than the other opening in the air flow channel, the fan producing flowing air; and a radiator located closer to the other opening of the two openings (81a, 83a) than the one opening in the air flow channel, the radiator carrying out heat exchange between the medium and air flowing through an interior of the air flow channel, the exterior case provided with two ventilation holes to which the two openings (81a, 83a) are connected directly or via an air passageway, respectively, the duct comprising a plurality of separable parts; wherein the plurality of separable parts of the duct include at least a first duct (59A1) located close to the one opening; and wherein the plurality of separable parts of the duct include, in addition to the first duct (59A1), an upper duct and a lower duct which are vertically separable from each other.