Patent ID: 8256097

Claim:
A method for manufacturing a coil device comprising a ring-like core with a coil wound therearound, the coil including a winding portion formed by a conductive wire wound around the core, and a pair of lead parts formed by the conductive wire projecting from both ends of the winding portion, the conductive wire having a cross-sectional shape with a height dimension greater than a width dimension, and the conductive wire which forms the winding portion being aligned in a widthwise direction of the conductive wire along an outer peripheral surface of the core and repeatedly wound, comprising; a first step of twisting a tip end part of the conductive wire by 90 degrees or approximately 90 degrees with respect to a conductive wire portion arranged rearward continuously from the tip end part to form a twist part, and bending the tip end part of the conductive wire in a direction where the second moment of area is smaller and winding the conductive wire around an outer periphery surface of the core; a second step of bending the conductive wire arranged rearward continuously from the twist part in a direction where the second moment of area is greater and winding the conductive wire around the outer periphery surface of the core to form the winding portion; and a third step of transforming the conductive wire on a tip end side with respect to the twist part in a direction apart from the outer periphery surface of the core to form one lead part extending substantially linearly, and forming the other lead part by the conductive wire arranged rearward continuously from the winding portion.