NOVELTY - A fuel cell comprises a fuel gas channel (46) formed on one surface of a separator (28) for supplying a fuel gas from a center to an outer circumferential portion along a surface of the anode; and an oxygen-containing gas channel (comprising a deformable elastic channel component) formed on the other surface of the separator for supplying an oxygen-containing gas along a surface of the cathode, where separator has a fuel gas inlet (38) for supplying the fuel gas before consumption to the fuel gas channel. The fuel gas channel comprises grooves (48a) and ridges (50a) provided alternately.    USE - Used as solid oxide fuel cell useful for a fuel cell system used in stationary and mobile applications, e.g. for mounting on a vehicle.    ADVANTAGE - The fuel cell has a simple structure in which it is possible to uniformly and suitably supply a reactant gas over the entire electrode surface of an electrolyte electrode assembly. A uniform power generation reaction can be achieved, while improving the reactant gas utilization ratio. It is possible to prevent losses in the collected electricity, thus improvement in the performance of collecting electricity from the fuel cell can be achieved.    DETAILED DESCRIPTION - A fuel cell formed by stacking an electrolyte electrode assembly and a separator, where electrolyte electrode assembly includes an anode, a cathode, and an electrolyte interposed between the anode and cathode, comprises a fuel gas channel formed on one surface of the separator for supplying a fuel gas from a center to an outer circumferential portion along a surface of the anode; and an oxygen-containing gas channel formed on the other surface of the separator for supplying an oxygen-containing gas along a surface of the cathode, where separator has a fuel gas inlet for supplying the fuel gas before consumption to the fuel gas channel, and the fuel gas channel comprises grooves and ridges provided alternately toward the outer circumferential portion on the surface of the anode. A groove width of adjacent grooves arranged between the ridges increases gradually toward the outer circumferential portion on the surface of the anode. The grooves comprise ring shaped grooves formed around the fuel gas inlet; a connection groove (52) connecting adjacent ring shaped grooves; a continuous spiral groove extending in a spiral pattern around the fuel gas inlet; and grooves branched from around the fuel gas inlet, and extending in a serpentine pattern toward the outer circumferential portion on the surface of the anode. The oxygen-containing gas channel comprises a deformable elastic channel component, which is provided on the other surface of the separator in tight contact with the cathode. An area in which the elastic channel component is disposed is smaller than a power generation area of the anode. The elastic channel component comprises an electrically conductive mesh component. The oxygen-containing gas channel is formed by protrusions provided on the other surface of the separator. Protrusions comprise solid portions formed on one surface of the separator by etching.    DESCRIPTION OF DRAWING(S) - The figure is a partial enlarged view showing one surface of a separator.    Separator (28)    Fuel gas inlet (38)    Fuel gas channel (46)    Grooves (48a)    Ridges (50a)    Connection groove (52)