To prevent the center position of a rod from moving, prevent noises, make it easy to mount the rod in a receiving hole in a door, and prevent the rod from dropping during use.

A disc-shaped collar part 6 is provided at one end of a cylindrical main body 5 made of plastic which is fitted into a receiving hole 4 in a door, and a plurality of skirt parts 8 are provided at the other end of the cylindrical main body 4, with the outer surface 8a of each skirt part 8 tapered. A guide hole 10 is provided in a center portion between the disc-shaped collar part 6, the cylindrical main body 5, and the skirt part 8, the disc-shaped collar part 6 is made to abut to one side of an end face plate 2 or that of a guide plate 3, and a shoulder part 8b at the first end of the skirt part 8 is made to abut to the other side of the end face plate 2 or guide plate 3.