NOVELTY - A warm-up apparatus for a fuel evaporator comprises: (i) a catalyst combustor for exhaust gas from fuel cell; (ii) an exhaust gas passage; and (iii) a combustion gas transferring device. Fuel is injected from an injection portion to a combustion catalyst, where it is burned to produce combustion gas, which is transferred to catalyst combustor. The combustion gas transferring device is positioned on one side of exhaust gas passage to combustor.    USE - For fuel evaporators (fuel vaporizers) that supply raw fuel gas to reformers in fuel cells.    ADVANTAGE - It is possible using the evaporator to carry out low temperature combustion with little NOx emission, enabling the catalyst combustor to rise to the starting temperature, while emitting clean exhaust gas to the outside. Back fire towards the exhaust gas passage can be prevented in a reliable manner. The structure of combustion gas transferring device enables a stable composition of the combustion gas and uniform heat impartment to the following catalyst combustor. The apparatus offers an actuation/warm-up system enabling quick and reliable warm-up operation, which is compact, with low electricity consumption and which enables clean exhaust gas emission.    DETAILED DESCRIPTION - A warm-up apparatus (1) for fuel evaporator (2) comprises:    (i) a catalyst combustor (20) for burning exhaust gas from a fuel cell (6) to produce combustion gas and supplying fuel evaporator (which evaporates raw fuel liquid) with the combustion gas produced, as evaporation heat source;    (ii) an exhaust gas passage for transferring exhaust gas to catalyst combustor; and    (iii) a combustion gas transferring device (10) including a fuel injection portion (30) and a combustion catalyst.    DESCRIPTION OF DRAWING(S) - The figure shows a block diagram of the overall structure of a fuel cell system with a warm-up apparatus for a fuel evaporator.    Warm-up apparatus (1)    Fuel evaporator (2)    Reformer (3)    Fuel cell (6)    Combustion gas transferring device (10)    Catalyst combustor (20)    Fuel injection device (30)