The present invention provides a fuel cell device with a valve mechanism connected with a fuel cell unit and a fuel cartridge, the valve mechanism ensures that no liquid leakage occurs during disconnection of the valves. The fuel cell device has the valve mechanism (5) composed of valves (11, 21) provided to a fuel cell unit and a fuel cartridge, respectively, and part of the male valve (21) is inserted into the female valve (11) to cause their respective stems (19, 29) extending from the respective valve seal parts (13, 23) towards the valve ends to be pushed in so as to open the valve seal parts (13, 23) and to communicating two valve each other. A cylindrical resilient member (31) is fitted on the stem (19) of the female valve (11) such that its peripheral wall (30) will be warped outwardly when pushed by the male valve (21) as the valves are being connected, and liquid fuel that has remained outside the valve seal part (13) is sucked into the tubular space around the stem of the female valve as the valves are being disconnected.