<p>There are provided a coil apparatus having a divided winding conformation and a manufacturing method of the coil apparatus which can prevent a winding from collapsing while achieving a reduction in size of a core and simplification of a structure. A coil apparatus 501 includes a ferrite core 503 and a coil 505 provided around the core. The coil 505 includes at least a first coil portion 551 and a second coil portion 553, and a boundary end surface CF 1 of the first coil portion on the second coil portion side is inclined in such a manner that its inner peripheral side is closer to the second coil portion than its outer peripheral side. Further, a boundary end surface CF 2 of the second coil portion on the first coil portion side is inclined in such a manner that its outer peripheral side is closer to the first coil portion than its inner peripheral side.</p>
