Coil component

Disclosed herein is a coil component that includes: a first core having a mounting surface and a coil placing surface positioned opposite to the mounting surface; a lower coil placed on the coil placing surface such that a coil axis of the lower coil extends substantially perpendicular to the coil placing surface; an upper coil substantially coaxially stacked on the lower coil; and a second core disposed through inner diameter areas of the lower and upper coils. The number of turns of one of the lower and upper coils is larger by less than one turn than other one of the lower and upper coils. The diameter of the second core is larger at a first section surrounded by the other one of the lower and upper coils than at a second section surrounded by the one of the lower and upper coils.