NOVELTY - The fuel cell system has a manifold having stacked structure including a fuel-gas layer (3a) for distributing fuel gas, a cooling water layer (3b) for distributing cooling water, and oxidizing gas reservoir (3c) for distributing oxidizing gas. A temperature rising rod or plate (10) is mounted in contact with a side of the cooling water layer, using molding process.    USE - For fuel cell system for use in motor vehicle.    ADVANTAGE - The cooling water can be heated up in the location near the fuel cell stack, quickly and easily using simple process without providing exclusive space for installing the temperature rising plate or rod. The fuel cell system can be driven efficiently, without the need for large secondary battery or large external power supply for heating. The fall in temperature can be prevented. The space occupied by the fuel cell system in the motor vehicle, is reduced.    DETAILED DESCRIPTION - The temperature rising rod or plate and cooling water layer, have corrugated contact surfaces. The heat insulation sheets are inserted between the temperature rising rod or plate and fuel gas layer, and between temperature rising rod or plate and oxidizing gas reservoir. The cooling water layer is made of metal, and fuel gas layer and oxidizing gas reservoir are made of resin. A temperature detector is mounted in cooling water inlet port or exit port, for detecting the temperature of the cooling water. The electricity is supplied to the temperature rising plate or rod, when the detected water temperature is less than preset value. The temperature of external air, is detected such that electricity is supplied to temperature rising rod or plate, when detected external temperature is less than preset value. The supply of electricity to the temperature rising plate or rod, is stopped when electricity generated by the fuel cell stack, is greater or equal to preset value.    DESCRIPTION OF DRAWING(S) - The figure shows an exploded perspective view of the manifold of the fuel cell system.    Fuel cell stack (2)    Manifold (3)    Fuel-gas layer (3a)    Cooling water layer (3b)    Oxidizing gas reservoir (3c)    Temperature rising plate or rod (10)