Common mode choke coil and manufacturing method therefor

The purpose of the present invention is to provide a common mode choke coil with high impedance and low variation. Provided is a common mode choke coil comprising: a magnetic core (11) constituted bya winding core section (12) and a pair of collar sections (13) provided on both ends of the winding core section (12); external electrodes (18) formed in the respective collar sections (13); a pair ofwindings (17) wound around the winding core section (12), the ends of the pair of windings being drawn out to the external electrodes (18) and bonded thereto; and a magnetic plate (14) bonded to thepair of collar sections (13) with an adhesive agent (19). The magnetic plate (14) has bonding sections (15) bonded to the collar sections (13) and an opposing section (16) that opposes the winding core section (12). The bonding sections (15) of the magnetic plate have a surface roughness that is set to be less than the surface roughness of the opposing section (16). 本公开提供种共模扼流线圈及其制造方法，目的在于得到高阻抗且偏差小的共模扼流线圈。共模扼流线圈具备：磁芯(11)，具有