To secure excellent visibility of a reflecting member and to eliminate the camber of the member resulting from achieving firm mounting to a guard fence.

The guard fence 1 constituted by bolt-joining a bracket 16 for connecting a beam pipe longitudinally, to a post 11 includes a delineator 4 having a body part 45 provided with the reflecting member 51 on the surface, a projecting piece 42 projected from the upper end of the body part 45, and a fixed piece 41 projected from the lower end of the body part 45 and formed with an opening slit 43 opened to the side. The projecting piece 42 and the fixed piece 41 of the delineator 4 are held between the bracket 16 and the post 11, and the projecting pieces 42 and fixed pieces 41 in the vertically adjacent delineators 4 are spaced from each other.