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; and an inter-connector which has a base portion and a plurality of projecting portions projecting from the base portion toward the fuel cell body and electrically connected to the fuel cell body and which is integrally formed from a metallic material; characterized in that: each of the projecting portions has a contour composed of a pair of linear portions (161, 162) which are disposed parallel to each other and each of which includes a straight line, and a pair of curved portions (163, 164) which connect opposite ends of the linear portions (161, 162); and a cross section of each projecting portion taken along a straight line connecting the centers of the pair of linear portions (161, 162) and perpendicular to the pair of linear portions (161, 162) has 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. 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; and an inter-connector which has a base portion and a plurality of projecting portions projecting from the base portion toward the fuel cell body and electrically connected to the fuel cell body and which is integrally formed from a metallic material; characterized in that: each of the projecting portions has a contour composed of a pair of linear portions (161, 162) which are disposed parallel to each other and each of which includes a straight line, and a pair of curved portions (163, 164) which connect opposite ends of the linear portions (161, 162); and a cross section of each projecting portion taken along a straight line connecting the centers of the pair of linear portions (161, 162) and perpendicular to the pair of linear portions (161, 162) has 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. each of the projecting portions has a contour composed of a pair of linear portions (161, 162) which are disposed parallel to each other and each of which includes a straight line, and a pair of curved portions (163, 164) which connect opposite ends of the linear portions (161, 162); and a cross section of each projecting portion taken along a straight line connecting the centers of the pair of linear portions (161, 162) and perpendicular to the pair of linear portions (161, 162) has 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.