A fuel cell is formed by laminating a plurality of power generating units. The power generating unit includes: a membrane electrode gas diffusion layer assembly; a sealing portion disposed along its outer circumference; a porous body flow path in which oxidant gas supplied to a cathode-side catalytic layer flows; a shielding plate provided between the sealing portion and the porous body flow path; and first, second separator plates configured to sandwich the membrane electrode gas diffusion layer assembly and the porous body flow path therebetween. The shielding plate, the porous body flow path, and the first separator plate making contact with the porous body flow path project into the oxidant exhaust gas discharge manifold determined by the sealing portion.