NOVELTY - A desulfurizing device (20) for a fuel cell comprises a dehydrating element (23) through which a fuel flows, where the dehydrating element absorbs moisture included in the fuel; and a desulfurizing element (25) for absorbing a sulfur compound included in the fuel that flows out of the dehydrating element.    USE - As a desulfurizing device for removing sulfur compounds, including mercaptan and thiophene, from fuel; useful in a fuel cell system useful for producing electricity from fuel, including hydrocarbon fuel such as natural gas, city gas, liquid petroleum gas (LPG), naphtha (claimed).    ADVANTAGE - The desulfurizing device for a fuel cell has improved desulfurizing efficiency and decreases the volume of a desulfurizing material and also its cost. The desulfurizing device includes dehydrating element that selectively absorbs moisture from fuel before it is supplied to a desulfurizing element, thus improving its desulfurization performance and decreasing the volume of a desulfurizing material.    DETAILED DESCRIPTION - A desulfurizing device (20) for a fuel cell comprises a dehydrating element (23) through which a fuel flows, where the dehydrating element absorbs moisture included in the fuel; and a desulfurizing element (25) for absorbing a sulfur compound included in the fuel that flows out of the dehydrating element. The desulfurizing element absorbs a sulfur compound included in the fuel flowing out of the dehydrating element if temperature of the desulfurizing element is below a predetermined temperature, and the desulfurizing element desorbs a sulfur compound included in the desulfurizing element whenever the desulfurizing element is heated above the predetermined temperature. The desulfurizing material is ion-exchanged with a metal selected from noble metal and/or transition element. An INDEPENDENT CLAIM is included for a fuel cell system comprising at least one electricity generating element producing electricity through an electrochemical reaction of a fuel and an oxidant;a fuel supplier supplying the electricity generating element with the fuel;an oxidant supplier supplying the electricity generating element with the oxidant; and the desulfurizing device coupled to the fuel supplier.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of the desulfurizing device.    Desulfurizing device (20)    Fuel inlet (21)    Fuel outlet (22)    Dehydrating element (23)    Desulfurizing element (25)    Desulfurizing material. (26)