A coil
assembly and a method of forming the same are provided. The coil
assembly includes a main body having first and second surfaces facing each other in a first direction and third through sixth surfaces connecting the first and second surfaces, a coil disposed in the main body and including a lead-out portion, and an external
electrode including a base portion disposed on the third and fourth surfaces, an
insertion portion bent from one end of the base portion and having at least a portion thereof inserted into the main body, and a pad portion bent from the other end of the base portion and extending to the first surface, wherein each of the third through sixth surfaces includes first and second inclined surfaces inclined in different directions with respect to the first direction, and the
insertion portion includes one surface facing the first surface and another surface facing the second surface, and the lead-out portion contacts the one surface of the
insertion portion.