Patent ID: 8742879

Claim:
A transformer comprising: a winding part having a plurality of coils wound on an outer peripheral surface of a cylinderically shaped body part while being stacked thereon; and a terminal connection part extended from one end of the winding part in an outer diameter direction and having a plurality of external connection terminals coupled to a distal end thereof, the terminal connection part including at least one lead groove formed in a radial direction and at least one catching groove formed in the lead groove in a manner in which a width of the lead groove is extended in a winding direction of the coils, wherein the coils include a plurality of primary coils and a plurality of secondary coils, and the catching groove is formed in a position corresponding to a primary coil or a secondary coil that is continuously wound in the winding part while being stacked therein, and a sidewall of the catching groove is formed in a position in which the sidewall is spaced apart from a contact surface on which the primary coil and the secondary coil contact each other in a radial direction by a predetermined distance.