At one ends of a pair of coil wires 30, a pair of turn portions 42 are crossed. Further, the other ends of the coil wires 30 are held such that an angle θ between the axes of the coil wires 30 falls in a predetermined range (e.g., greater than or equal to 10° and less than or equal to 90°). Then, the coil wires 30 are rotated respectively about their axes in the same direction, so that corresponding pairs of turn portions 42 of the coil wires 30 are sequentially crossed from the one ends to the other ends, thereby interlacing the coil wires 30.