a fuel cell discharge - gas processing device that dilutes anode off - gas discharged from a fuel cell anode by mixing the anode off - gas with a diluent gas so as to produce a diluted gas and then discharges mixture of the anode off - gas and the diluent gas , includes : a dilution container ; an anode off - gas introduction path ; a diluent gas path through ; a diluent gas emission hole ; a mixed gas discharge hole ; at least one partition panel ; and a communication gas path , wherein the anode off - gas emission hole is provided so as to emit anode off - gas toward the partition panel .