A coil antenna has a core that is plate- shaped and includes a magnetic material; a coil wire that is wound around the core; a first insulating layer that is arranged on a surface of the core, the insulating layer being arranged to cover the coil wire and have a flat surface opposite the core; a second insulating layer that is arranged on a rear face opposite the surface of the core, the second insulating layer being arranged to cover the coil wire and to have a flat surface opposite the core; a flat first metal layer arranged on the flat surface of the first insulating layer; and a flat second metal layer arranged on the flat surface of the second insulating layer.
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