A fuel cell formed by laminating a plurality of power generating units,: each of the power generating units includes: a membrane electrode gas diffusion layer assembly including an electrolyte membrane, an anode-side catalytic layer, and a cathode-side catalytic layer such that the electrolyte membrane is sandwiched between the anode-side catalytic layer and the cathode-side catalytic layer; a sealing portion disposed along an outer circumference of the membrane electrode gas diffusion layer assembly; a porous body flow path disposed so as to be opposed to the cathode-side catalytic layer and in which oxidant gas supplied to the cathode-side catalytic layer flows; a shielding plate provided between the sealing portion and the porous body flow path; and first, second separator plates (150, 160) configured to sandwich the membrane electrode gas diffusion layer assembly and the porous body flow path therebetween, the fuel cell characterized in that the sealing portion and the first, second separator plates (150, 160) have openings at positions corresponding to each other, the openings communicate with each other when the plurality of power generating units is laminated, so as to form an oxidant exhaust gas discharge manifold through which oxidant exhaust gas is discharged from the porous body flow path, the first separator plate makes contact with the porous body flow path, and the shielding plate, the porous body flow path, and the first separator plate project into the oxidant exhaust gas discharge manifold defined by the sealing portion. each of the power generating units includes: a membrane electrode gas diffusion layer assembly including an electrolyte membrane, an anode-side catalytic layer, and a cathode-side catalytic layer such that the electrolyte membrane is sandwiched between the anode-side catalytic layer and the cathode-side catalytic layer; a sealing portion disposed along an outer circumference of the membrane electrode gas diffusion layer assembly; a porous body flow path disposed so as to be opposed to the cathode-side catalytic layer and in which oxidant gas supplied to the cathode-side catalytic layer flows; a shielding plate provided between the sealing portion and the porous body flow path; and first, second separator plates (150, 160) configured to sandwich the membrane electrode gas diffusion layer assembly and the porous body flow path therebetween, a membrane electrode gas diffusion layer assembly including an electrolyte membrane, an anode-side catalytic layer, and a cathode-side catalytic layer such that the electrolyte membrane is sandwiched between the anode-side catalytic layer and the cathode-side catalytic layer; a sealing portion disposed along an outer circumference of the membrane electrode gas diffusion layer assembly; a porous body flow path disposed so as to be opposed to the cathode-side catalytic layer and in which oxidant gas supplied to the cathode-side catalytic layer flows; a shielding plate provided between the sealing portion and the porous body flow path; and first, second separator plates (150, 160) configured to sandwich the membrane electrode gas diffusion layer assembly and the porous body flow path therebetween, the fuel cell characterized in that the sealing portion and the first, second separator plates (150, 160) have openings at positions corresponding to each other, the openings communicate with each other when the plurality of power generating units is laminated, so as to form an oxidant exhaust gas discharge manifold through which oxidant exhaust gas is discharged from the porous body flow path, the first separator plate makes contact with the porous body flow path, and the shielding plate, the porous body flow path, and the first separator plate project into the oxidant exhaust gas discharge manifold defined by the sealing portion.