To wire a cable efficiently by utilizing the groove of the underside of a deck plate.

An engaging section 1 engaged with the inside of an opening section inserted into the groove of a deck plate and indented is formed. A press-contact bonding piece 2 contact-bonded on the outside of the opening section of the groove is formed under the engaging section 1. A support member 3 supporting a cable is shaped under the press-contact bonding piece 2. The engaging section 1 and the press-contact bonding piece 2 are divided and formed into the support member 3, in which an upper section is opened, respectively, and the cable is wired into the support member 3 from the divided sections of the engaging section 1 and the press-contact bonding piece 2. Other cable supporters are connected detachably to the lower section of the support member 3 in the support member 3.