To provide a helical antenna which realizes reduction of a manufacturing man hour and is more excellent in productivity, while adopting a tap feed system.

As for this helical antenna, while an antenna element 10 and a feeder are connected via a conducting wire connected to the spiral antenna element 10, impedance matching between the antenna element 10 and the feeder is taken by the conducting wire. Here, the antenna element 10 comprises: a plate-like metallic member; a plurality of bent parts 11a-11h installed, side by side, in the direction in alignment with a spiral medial axis m where ones which adjoin each other mutually are bent in a reverse direction against a board thickness direction; and connection parts 12a-12g that connect, in bellows shape, these bent parts 11a-11h in the direction in alignment with the medial axis m. In addition, the conducting wire connected to the middle between both ends of the antenna element 10 comprises plate-like derivation parts 13a, 13b derived from the connection parts 12a, 12c.