Disclosure relates to a road delineator installed at a road facility, such as a guardrail, to reflect light from car headlights, and more specifically, an angle adjustment part of the delineator having a cover hinged to a stationary body has a simple structure to facilitate angle adjustment of the hinged cover, the head of an anchor bolt is easily inserted into the stationary body that is installed at the road facility yet the anchor bolt is not easily separated from the stationary body once the head thereof sits in the stationary body, such that the delineator at the road facility can be installed conveniently, and a backing metal is embedded in the bottom plate of the stationary body to protect the bottom plate of the stationary body made of a synthetic resin material from damages caused by the head of the anchor bolt when the anchor bolt is forcedly fastened to the road facility.