To provide a portable terminal device equipped with an antenna which does not spoil the beauty of the outward appearance and is reduced in cost and usable even as a strap for portage or fixation although the performance is high.

This device is composed of a conductor and a connector which is connected thereto and a mechanically flexible antenna is used as at least part of the conductor. The conductor constituting the antenna is in a Y shape having two branches and common use for two frequency bands may be made possible by the branching conductors which differ in length. Further, the antenna may be used in common as the strap for portage or fixation.