The embodiment of the invention discloses a coil device and an electronic device. Wherein the coil device comprises a first coil in a spiral shape including a plurality of turns of sub-coils arrangedfrom the inside to the outside in the same plane; A lead wire located on one side of the plane of the first coil, the inner end of the lead wire is electrically connected with the inner end of the first coil, and the lead wire crosses from the inner side of the first coil to the outer side of the first coil; A side of the first coil away from the lead wire is flush; A portion of the first coil that faces the lead wire in a direction perpendicular to the plane, and/or a portion of the lead wire that faces the first coil in a direction perpendicular to the plane, the thickness in the direction perpendicular to the plane being smaller than the thickness in the direction perpendicular to the plane of at least a portion of the region of the first coil that does not face the lead wire in a direction perpendicular to the plane. The technical proposal of the embodiment of the invention can reduce the thickness and the volume of the coil device, thereby reducing the volume of the contactless electric energy transmission device.