a fuel cell system includes : a fuel cell which generates electricity by supplying hydrogen to an anode electrode , and a reaction gas to a cathode electrode , an anode gas supply device which supplies hydrogen to the anode electrode , and a cathode gas supply device which drives a compressor using electric power generated by the fuel cell , and supplies pressurized reaction gas to the cathode electrode . the fuel cell system further includes a target pressure setting device which sets a target value for cathode pressure of the fuel cell , a correction device which corrects the target value in accordance with atmospheric pressure , and a control device which controls the cathode pressure of the fuel cell to the corrected target value . efficient electric power generation can be performed in accordance with the ambient environment .