The present invention relates to a fuel cell system including a fuel cell, a hydrogen gas piping system for supplying a hydrogen gas to the fuel cell, an injector which adjusts a gas state on an upstream side of the hydrogen gas piping system to supply the gas to a downstream side, and a control device which drives and controls the injector in a predetermined driving period, wherein a driving characteristic of the injector is learnt, and a driving parameter of the injector can be set based on a result of the learning. In the present invention, during an operation of the fuel cell, a supply pressure of the hydrogen gas can appropriately be changed in accordance with an operation state. In addition, even when the pressure is broadly varied, a satisfactory pressure response property can be secured regardless of fluctuations due to aging and individual difference of the injector.