Terminal structure of coil device

A terminal structure of a coil device, comprising:

• a coil that includes a bobbin and a rectangular conductive wire having a flattened quadrangular shape in cross section, wherein the wire is covered with a dielectric film and wound around the bobbin;
• and
• a terminal that includes a fusing part, wherein:
• an end portion of the wire, which extends out of the coil, has first and second flat surfaces that are opposed to each other, and the fusing part is electrically connected to the first and second flat surfaces by fusing;
• the fusing part includes:
• a planar portion that has a shape of a plate and is in surface contact with a first flat surface of the first and second flat surfaces;
• and
• a folded piece that extends from the planar portion and is folded in a direction perpendicular to a plane of the planar portion such that the end portion of the wire is clamped between the planar portion and the folded piece;
• the folded piece includes a contact surface portion which is in contact with a second flat surface;
• and
• the contact surface portion includes a stepped portion that is configured to increase an amount of deformation of a contact area of the second flat surface which is in contact with the stepped portion, in comparison to an adjacent area of the second flat surface that is adjacent to the contact area.