WOUND CORE

A wound core comprising a wound core body having a substantially rectangular shape in a side view, the wound core body including a portion in which grain-oriented electrical steel sheets are laminated in a sheet thickness direction, the grain-oriented electrical steel sheets each having planar portions and corner portions alternately successively extending in a longitudinal direction, with two of the planar portions adjacent to each other with each corner portion therebetween forming an angle of 90°. The wound core body has a substantially rectangular laminated structure in the side view. Each of the corner portions includes two or more bent portions having a curved shape in the side view of the grain-oriented electrical steel sheets 1, wherein the total of the bending angles of the bent portions present at each corner portion is 90°. Each bent portion in the side view has an inner-side radius r of curvature of 1 mm to 5 mm inclusive. In at least some of the planar portions, an interlayer coefficient of friction, which is the coefficient of dynamic friction of the laminated grain-oriented electrical steel sheets, is greater than or equal to 0.2.