NOVELTY - The fuel cell system has a load management unit (300) that adjusts the load based on requested electric power with respect to a fuel cell. A limiting unit (200) sets a limiting value to the load adjusted by the load management unit during warming-up of the fuel cell based on temperature difference of the amount of generated water accompanying electric power generation or component such as cathode pressure regulation valve, purge valve, and purge valve and fuel cell when temperature of components is lower than the freezing point temperature.    USE - Fuel cell system for vehicle.    ADVANTAGE - Shortens warming-up time after starting the fuel cell stack until warming-up is completed since amount of self-heating of the fuel cell stack increases by increasing the generated electric power consumed with the cooling water pump and heater. Prevents freezing of the components since warming-up of the cathode pressure regulation valve, purge valve, and purge valve is completed before generated water is discharged from the fuel cell stack. The power consumption is efficiently reduced by lowering the lower limit gradually. The freezing of discharge valve by generated water is prevented since generated water is discharged from the fuel cell stack after the discharge valve temperature heats up to zero degrees Celsius. The freezing of components provided in the discharge pathway is prevented since warming-up restriction unit suppresses the generation amount of generated water by limiting the load based on electric power generation request for warming-up. Suppresses freezing of discharge valve since warming-up is completed rapidly. The discharge valve is warmed up at early stage efficiently since heat release to the discharge valve by cooling water increases when temperature difference is large so that upper limit is made high and warming-up is promoted. Improves fuel consumption since consumption of useless generated electric power with the cooling water pump and heater is held down during warming-up. The freezing of components provided in the discharge pathway at the time of freezing point starting of fuel cell is prevented since heat release to the components by cooling water is adjusted by limiting the supply amount of generated electric power with respect to the load of auxiliary machine of the fuel cell system.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the function structure of a controller. (Drawing includes non-English language text).    Controller (160)    Warming-up control unit (161)    Limiting unit (200)    Load management unit (300)    Command unit (400)