FUEL CELL SYSTEM

A fuel cell system includes: a fuel cell unit including a fuel cell, an anode flow path, a cathode flow path, and a heat exchanger configured to heat the cathode gas to be supplied to the fuel cell; and a manifold attached to the fuel cell unit and configured to distribute and supply the cathode gas to the cathode flow path. The cathode flow path includes a main flow path passing through the heat exchanger, a bypass flow path bypassing the heat exchanger and connected to the main flow path, and a partial reformation flow path through which a gas for partial oxidation reformation is supplied to the anode flow path.