The antenna main body having the conductor wound around thereon and the radio
wave receiving parts for receiving the radio waves are formed independently, the
area of the radio wave receiving region of the radio wave receiving parts is formed
to be larger than a cross sectional area of the antenna main body in the direction
orthogonal to the winding direction of the conductor, and the radio wave receiving
parts are arranged so as to be in contact with the antenna main body at the ends
in the winding direction of the conductor.
