A fuel cell system comprising: a fuel cell; a control unit that comprises a setting unit configured to set a target current value of the fuel cell based on an output request for the fuel cell; and an output control unit that is configured to control an output current value of the fuel cell from a low current region to a high current region, based on the target current value, and to acquire an output voltage value of the fuel cell in the low current region while the output is increasing; wherein the fuel cell system is characterized in that the control unit further comprises: a prediction unit configured to predict that a voltage drop of the fuel cell occurs in a high current region of the fuel cell, based on the acquired output voltage value of the fuel cell in the low current region of the fuel cell, when the output current value of the fuel cell is in the low current region and the target current value is above a current threshold that is set in the high current region; and a resetting unit configured to reset the target current value to a current value that is smaller than the set target current value, when it is predicted that the voltage drop occurs, wherein the prediction unit is configured to predict that the voltage drop occurs, when the output voltage value of the fuel cell at a predetermined current value in the low current region is above a voltage threshold. a fuel cell; a control unit that comprises a setting unit configured to set a target current value of the fuel cell based on an output request for the fuel cell; and an output control unit that is configured to control an output current value of the fuel cell from a low current region to a high current region, based on the target current value, and to acquire an output voltage value of the fuel cell in the low current region while the output is increasing; a setting unit configured to set a target current value of the fuel cell based on an output request for the fuel cell; and an output control unit that is configured to control an output current value of the fuel cell from a low current region to a high current region, based on the target current value, and to acquire an output voltage value of the fuel cell in the low current region while the output is increasing; wherein the fuel cell system is characterized in that the control unit further comprises: a prediction unit configured to predict that a voltage drop of the fuel cell occurs in a high current region of the fuel cell, based on the acquired output voltage value of the fuel cell in the low current region of the fuel cell, when the output current value of the fuel cell is in the low current region and the target current value is above a current threshold that is set in the high current region; and a resetting unit configured to reset the target current value to a current value that is smaller than the set target current value, when it is predicted that the voltage drop occurs, wherein a prediction unit configured to predict that a voltage drop of the fuel cell occurs in a high current region of the fuel cell, based on the acquired output voltage value of the fuel cell in the low current region of the fuel cell, when the output current value of the fuel cell is in the low current region and the target current value is above a current threshold that is set in the high current region; and a resetting unit configured to reset the target current value to a current value that is smaller than the set target current value, when it is predicted that the voltage drop occurs, wherein the prediction unit is configured to predict that the voltage drop occurs, when the output voltage value of the fuel cell at a predetermined current value in the low current region is above a voltage threshold.