Common mode choke coil

A common mode choke coil adapted for surface mount applications is provided which is minimized in overall size (particularly in height), and has an improved bonding coefficient. This common mode choke coil incorporates a structure comprising a ferrite core having two substantially square planer flanges formed integrally on both ends of a winding core thereof, each flange joined directly with a pair of external electrodes, a plurality of windings wound about the winding core of the ferrite core and connected by thermal bonding to sides of the external electrodes at four recesses provided in the left and right sides of each flange, and a ferrite plate bonded by an adhesive to the outermost surface of the windings to join the two flanges at both ends of the ferrite core. As a result, a closed magnetic circuit structure of a cubic component having a high rate of bonding coefficient is obtained.