To facilitate mounting a protective tube to an overhead wire.

A protection-tube fixture 300 has a protection-tube supporting section 301, an operating rod 302 and an attachment 316. The protection-tube supporting section 301 is formed in an approximately V-shaped cross section, and a frictional material 303 is located on the internal angle side of the protection-tube supporting section 301. The frictional material 303 is brought into contact with the outer periphery 103 of the protection tube 100 along the longitudinal direction of the cylindrical protection tube 100 coating the stringing 250. The operating rod 302 is connected continuously to the protection-tube supporting section 301, and extended from the external angle side of the protection-tube supporting section 301. The attachment 316 connects the protection-tube supporting section 301 and the operating rod 302 in a relatively rockable manner in the longitudinal direction of the protection-tube supporting section 301. An operator can slide and move the protection tube 100 with the frictional material 303 in contact with the protection tube 100 when the frictional material 303 is pushed against the outer periphery 103 of the protection tube 100 and the operating rod 302 is pushed out in the longitudinal direction RX of the protection tube 100.