Fastener and securement subject having the fastener secured thereto

A fastener tape 4 is woven or knitted by using weaving yarns or knitting yarns having an electrically conductive fiber material 12, and the electrically conductive fiber material 12 is formed on the fastener tape 4 as a signal line 23 or an antenna line 21. When a fixing device having an identification medium 20 such as a radio IC chip is secured to a securement subject 25, the identification medium 20 is covered with the securement subject 25, so that a condition in which the identification medium 20 is attached to the securement subject 25 cannot be seen from outside. Although existence of the identification medium 20 cannot be recognized from outside, discriminating of whether or not the securement subject is real or forgery, commodity control of the securement subject and the like can be carried out by exchanging various kinds of data and information possessed by the identification medium 20.