Solid oxide fuel cell and inter-connector

A solid oxide fuel cell comprising:

• a fuel cell body which has a cathode layer, a solid electrolyte layer formed of an oxide, and an anode layer and which has a power generation function;
• a second fuel cell body which has a second cathode layer, a second solid electrolyte layer formed of an oxide, and a second anode layer and which has a power generation function;
• and
• an inter-connector integrally formed from a metallic material and interposed between the fuel cell body and the second fuel cell body, the inter-connector having a plurality of projecting portions projecting toward the fuel cell body and electrically connected to the fuel cell body, and a plurality of second projecting portions projecting toward the second fuel cell body and electrically connected to the second fuel cell body, wherein
• each of the projecting portions and the second projecting portions has a contour composed of a pair of linear portions which are disposed parallel to each other and each of which includes a straight line, and a pair of curved portions which connect opposite ends of the linear portions;
• and
• a cross section of each of the projecting portions and the second projecting portions taken along a straight line connecting the centers of the pair of linear portions and perpendicular to the pair of linear portions is divided into a first region whose radius of curvature is 1 to 70 mm, a pair of second regions whose first ends are connected to opposite ends of the first region and whose radius of curvature is 0.1 to 0.5 mm, and a pair of third regions which connect second ends of the second regions to the base portion.