Induction coil for cordless energy charging and data transfer

An induction coil for a cordless energy charging and data transfer is provided to charge energy and transfer data in a cordless mode by using an induction connection between a charger and a battery without a direct electric contact. An induction coil includes more than two printed circuit boards(50) with a prescribed circuit pattern(52) laminated. First ends(54) positioned on an outside of the circuit patterns are electrically connected by a first connection part(54a) penetrating the first ends, and second ends(56) positioned on an inside of the circuit patterns are electrically connected by a second connection part(56a) penetrating the second ends. The circuit pattern has a spiral form, and a laminated layer number of the printed circuit board, on which the circuit pattern is formed, is 2 to 15, and a number of winding turns of the spiral circuit pattern is 5 to 50, and the most outer diameter of the spiral circuit pattern is 10 to 200 mm.