Abstract: An in-vehicle fuel cell system, including a fuel cell, and an auxiliary machine configured to exchange a gas with the fuel cell, the in-vehicle fuel system including an auxiliary machine structure configured to accommodate the auxiliary machine, wherein the fuel cell includes a first fuel cell fixed to an upper surface of the auxiliary machine structure and a second fuel cell fixed to a lower surface of the auxiliary machine structure, the auxiliary machine structure is disposed at substantially the same position in a height direction as a skeleton member of a vehicle body, and the first fuel cell and the second fuel cell are fixed to the skeleton member via the auxiliary machine structure.

Abstract: Provided is a fuel cell system that includes a plurality of fuel cell stacks and an exhaust combustor that combusts exhaust gas. The exhaust combustor is located at least between two fuel cell stacks and adjacent to each of the two fuel cell stacks.

Abstract: For a fuel cell including a first and a second fuel cell stack (2, 3; 32A, 32B, 32C; 42A, 42B, 42C, 42D) each having a lamination composed of a plurality of laminated cellular fuel cells (9, 10), and held by end plates (7A, 7B, 8A, 8B), a cooling structure has a first cooling circuit (4) provided in a first fuel cell stack (2), a second cooling circuit (5) provided in a second fuel cell stack (3), and a third cooling circuit (14) provided in an end plate (7B) of the first fuel cell stack (2), the third cooling circuit (14) comprising a branched inflow portion (14a; 34a; 44a) and a collecting outflow portion (14b; 35d; 45f) of a coolant, connected to the first and the second cooling circuit (4, 5).