ANTENNA DEVICE AND ELECTRONIC DEVICE

摘要

An antenna device (101), provided with: a coil antenna (2) having a coil conductor shaped so as to be wound in a helical shape; and a cylindrical conductor (1) enclosing the coil antenna (2). The cylindrical conductor (1) has a cylindrical shape having a first opening (11) and a second opening (12) with the axial direction essentially being the direction of a winding axis AX-AX of the coil conductor of the coil antenna (2), and also has a slit (1S) extending in the axial direction from the first opening (11) of the cylinder shape. An antenna device structured so that the surroundings of a coil antenna is enclosed by a metal casing or another conductor is thus formed.