There are provided a coil device, a method for manufacturing the coil, and a wireless power transfer system-charger or a wireless power transfer system-device, which includes the coil device. A coil device includes: a substrate including first and second terminals; and a first coil disposed on one surface of the substrate, the first coil being disposed while turning at least once, wherein the first coil includes a plurality of wires self-bonded to be stacked on the substrate, wherein one sides of the plurality of wires are commonly connected to the first terminal, and the other sides of the plurality of wires are commonly connected to the second terminal.