Patent ID: 7573364

Claim:
A common mode choke coil comprising: a toroidal core having an annular shape; two coils wound over the toroidal core in a circumferential direction thereof to form a bifilar winding, the coils having a winding-start portion and a winding-end portion with respect to the toroidal core; and a positioning portion defining a winding-start positioning part and a winding-end positioning part each in contact with the bifilar winding at the winding-start portion and the winding-end portion, respectively, wherein the positioning parts are provided integrally with the toroidal core, wherein the toroidal core has an inner peripheral surface, and wherein the positioning parts comprise a single projection projecting from the inner peripheral surface radially inwardly, the single projection providing a base end having one side and another side arrayed in a circumferential direction of the toroidal core, the one side serving as the winding-start positioning part and the another side serving as the winding-end positioning part.