There are provided a coil component and a board having the same. The coil component may include: a magnetic body including a substrate having two cores, first and second coil parts disposed on one surface of the substrate, and third and fourth coil parts disposed on the other surface of the substrate; a connection part disposed to penetrate through the two cores in the magnetic body and connecting the two cores to each other; and first to fourth external electrodes disposed on outer surfaces of the magnetic body and connected to the first to fourth coil parts.