To perform the mounting work of an accessary simply and rapidly by providing an accessary mounting part formed by expanding the mounting interval of ring-like protrusions at least at one position in the lengthwise direction.

Ring-like protrusions 2 are formed on the periphery of a snow accretion resistant wire 1 spaced at a constant interval in the lengthwise direction. The ring-like protrusions 2 are formed by solidifying a resin such as plastics into a ring-like shape and are so installed as to be spaced at an interval of around 20-110 cm. An accessary mounting part 2 formed by expanding the mounting interval of ring-like protrusions 2 is formed on the wire 1. The accessary mounting part 3 is formed at a position corresponding to a position at which an accessary such as a twist prevention damper is mounted after the wire 1 is installed on a pylon. Thereby, work such as removal of the ring-like protrusions 2 can be obviated in mounting those accessaries.