A solid oxide fuel cell comprising: a flat-plate-shaped cell structure including a cathode, an anode including a peripheral portion that is not opposite the cathode and having a larger outside diameter than the cathode, and an electrolyte layer interposed between the cathode and the anode, the electrolyte layer including a peripheral portion that does not face the cathode, the electrolyte layer containing a solid oxide; a frame-shaped sealing member disposed so as to surround a periphery of the cathode, the sealing member having a larger outside diameter than the cathode; a first pressing member and a second pressing member that hold the sealing member therebetween; and a flat-plate-shaped cathode current collector adjacent to the cathode, the flat-plate-shaped cathode current collector being formed of a porous metal body having a three-dimensional mesh-like skeleton, wherein the cathode current collector has a peripheral portion that is not opposite the anode, wherein the cathode current collector has a larger outside diameter than the anode, an outer edge portion of a main surface of the sealing member adjacent to the anode faces the first pressing member, an inner edge portion of the main surface of the sealing member adjacent to the anode faces the peripheral portion of the electrolyte layer, an outer edge portion of a main surface of the sealing member opposite the main surface of the sealing member adjacent to the anode faces the second pressing member and the peripheral portion of the cathode current collector, and an inner edge portion of the main surface of the sealing member opposite the main surface of the sealing member adjacent to the anode faces a body portion of the cathode current collector other than the peripheral portion of the cathode current collector. a flat-plate-shaped cell structure including a cathode, an anode including a peripheral portion that is not opposite the cathode and having a larger outside diameter than the cathode, and an electrolyte layer interposed between the cathode and the anode, the electrolyte layer including a peripheral portion that does not face the cathode, the electrolyte layer containing a solid oxide; a frame-shaped sealing member disposed so as to surround a periphery of the cathode, the sealing member having a larger outside diameter than the cathode; a first pressing member and a second pressing member that hold the sealing member therebetween; and a flat-plate-shaped cathode current collector adjacent to the cathode, the flat-plate-shaped cathode current collector being formed of a porous metal body having a three-dimensional mesh-like skeleton, wherein the cathode current collector has a peripheral portion that is not opposite the anode, wherein the cathode current collector has a larger outside diameter than the anode, an outer edge portion of a main surface of the sealing member adjacent to the anode faces the first pressing member, an inner edge portion of the main surface of the sealing member adjacent to the anode faces the peripheral portion of the electrolyte layer, an outer edge portion of a main surface of the sealing member opposite the main surface of the sealing member adjacent to the anode faces the second pressing member and the peripheral portion of the cathode current collector, and an inner edge portion of the main surface of the sealing member opposite the main surface of the sealing member adjacent to the anode faces a body portion of the cathode current collector other than the peripheral portion of the cathode current collector.