A fuel cell comprising: an electrolyte-layer-electrode assembly including an electrolyte layer and a pair of electrodes sandwiching the electrolyte layer; a first separator which has a plate shape and is electrically conductive, the first separator being disposed to contact the electrolyte-layer-electrode assembly and being provided with a first groove-shaped reactant gas channel on an inner surface thereof which contacts one of the electrodes; a second separator which has a plate shape and is electrically conductive, the second separator being disposed to contact the electrolyte-layer-electrode assembly and being provided with a second groove-shaped reactant gas channel on an inner surface thereof which contacts the other electrode; and one or more gas permeation suppressing sections (11, 12) for suppressing a gas from flowing to at least one of the electrodes; wherein the pair of electrodes includes a first and second gas diffusion layer (3a, 3b), wherein each of the inner surface of the first separator and the inner surface of the second separator has a region (hereinafter referred to as a first region) including at least a portion where the first reactant gas channel contacts one of the electrodes first from its upstream end in a flow direction of a first reactant gas when viewed in a thickness direction of the first separator, and a region (hereinafter referred to as a second region) including at least a portion where the second reactant gas channel contacts the other electrode first from its upstream end in a flow direction of a second reactant gas when viewed in the thickness direction of the first separator; wherein at least one of the first reactant gas channel and the second reactant gas channel is configured such that the gas permeation suppressing section is disposed to overlap with the first region when viewed in the thickness direction of the first separator; and wherein at least one of the first reactant gas channel and the second reactant gas channel is configured such that the gas permeation suppressing section is disposed to overlap with the second region when viewed in the thickness direction of the first separator and wherein a main surface of the gas permeation suppressing section has a plurality of through-holes which are arranged along the first reactant gas channel and/or the second reactant gas channel, wherein the main surface of the gas permeation suppressing section is in contact with at least one of the first and the second gas diffusion layer. an electrolyte-layer-electrode assembly including an electrolyte layer and a pair of electrodes sandwiching the electrolyte layer; a first separator which has a plate shape and is electrically conductive, the first separator being disposed to contact the electrolyte-layer-electrode assembly and being provided with a first groove-shaped reactant gas channel on an inner surface thereof which contacts one of the electrodes; a second separator which has a plate shape and is electrically conductive, the second separator being disposed to contact the electrolyte-layer-electrode assembly and being provided with a second groove-shaped reactant gas channel on an inner surface thereof which contacts the other electrode; and one or more gas permeation suppressing sections (11, 12) for suppressing a gas from flowing to at least one of the electrodes; wherein the pair of electrodes includes a first and second gas diffusion layer (3a, 3b), wherein each of the inner surface of the first separator and the inner surface of the second separator has a region (hereinafter referred to as a first region) including at least a portion where the first reactant gas channel contacts one of the electrodes first from its upstream end in a flow direction of a first reactant gas when viewed in a thickness direction of the first separator, and a region (hereinafter referred to as a second region) including at least a portion where the second reactant gas channel contacts the other electrode first from its upstream end in a flow direction of a second reactant gas when viewed in the thickness direction of the first separator; wherein at least one of the first reactant gas channel and the second reactant gas channel is configured such that the gas permeation suppressing section is disposed to overlap with the first region when viewed in the thickness direction of the first separator; and wherein at least one of the first reactant gas channel and the second reactant gas channel is configured such that the gas permeation suppressing section is disposed to overlap with the second region when viewed in the thickness direction of the first separator and wherein a main surface of the gas permeation suppressing section has a plurality of through-holes which are arranged along the first reactant gas channel and/or the second reactant gas channel, wherein the main surface of the gas permeation suppressing section is in contact with at least one of the first and the second gas diffusion layer.