NOVELTY - Fuel cell comprises stacked of electrolyte electrode assembly and separators. Each separator has a reactant gas supply unit. A flow path member (78) is detachably provided at the reactant gas supply unit. It includes an orifice section (80) having orifice holes (76a, 80a) for reducing a flow rate of the fuel gas or the oxygen-containing gas supplied from the reactant gas supply passage to the reactant gas supply channel.    USE - Fuel cell for producing fuel cell stack useful in stationary and mobile applications. Can also be used in vehicle and as solid oxide fuel cell.    ADVANTAGE - The fuel cell has simple and economical structure. It is capable of supplying reactant gases along electrode surfaces of stacked electrolyte electrode assemblies, and eliminates problems of entry of dust. Clogging in the channel holes connecting the reactant gas supply channel to the fuel gas channel or the oxygen-containing gas channel is prevented.    DETAILED DESCRIPTION - Fuel cell comprises stacked of electrolyte electrode assembly and separators. The electrolyte electrode assembly has an electrolyte interposed between an anode and a cathode. The electrolyte electrode assembly is sandwiched between the separators. Each separator has a sandwiching section having a fuel gas channel for supplying a fuel gas along an electrode surface of the anode and an oxygen-containing gas channel for supplying an oxygen-containing gas along an electrode surface of the cathode. A bridge is connected to the sandwiching section and has a reactant gas supply channel for supplying the fuel gas to the fuel gas channel or supplying the oxygen-containing gas to the oxygen-containing gas channel. A reactant gas supply unit is connected to the bridge. A reactant gas supply passage supplies the fuel gas or the oxygen-containing gas to the reactant gas supply channel extending through the reactant gas supply unit in a stacking direction. A flow path member (78) is detachably provided at the reactant gas supply unit. It includes an orifice section (80) having orifice holes (76a, 80a) for reducing a flow rate of the fuel gas or the oxygen-containing gas supplied from the reactant gas supply passage to the reactant gas supply channel. It includes a filter section (84) having filter holes for filtering the fuel gas or the oxygen-containing gas supplied from the reactant gas supply passage to the reactant gas supply channel.    DESCRIPTION OF DRAWING(S) - The drawing is an exploded view showing gas flows along the flow path member.    Orifice holes (76a, 80a)    Flow path member (78)    Orifice section (80)    Pressure regulating section (82)    Filter section (84)