COMMON MODE CHOKE COIL

PROBLEM TO BE SOLVED: To provide a common mode choke coil capable of improving high frequency characteristics, even in a case of having a winding with a large wire diameter.SOLUTION: A common mode choke coil comprises: a circular bobbin 3; a circular core 7 built in the bobbin 3; windings 1 and 2 respectively wound on both right and left sides of the bobbin 3 in the same direction, and having winding starts and winding ends positioned at an outside part of the bobbin 3; an insulation partitioning plate 6 of an EI shape provided on a vertical plane surface passing through a center of an annular part of the bobbin 3; and two L-shaped partitioning members 4 which include a vertical square bar provided between the winding start and the winding end of the winding 1 in a vertical direction in an outside part B of the annular part of the bobbin 3, and a horizontal square bar provided between the winding start and the winding end of the winding 2 in a horizontal direction in an inside part C of the annular part of the bobbin 3, and formed of an insulator.