A fuel cell system includes a fuel cell configured to generate power by
consuming a fuel gas and having an outlet port through which the fuel gas
flows out; a moisture removal unit configured to remove moisture
contained in the fuel gas that has been sent through the outlet port; a
burner located downstream of the moisture removal unit to combust the
fuel gas; and a gas pipe on-off valve configured to open and close a pipe
that makes the moisture removal unit and the burner communicate with each
other, and the fuel cell system is designed such that the gas pipe on-off
valve closes when the power generation stops.