PURPOSE: A guide rail with a hollow is provided to cover various collision heights from a truck to a two-wheeled vehicle and improve impact absorbing capacity by the extension of the collision area of an impact unit. CONSTITUTION: A guide rail comprises an impact portion and a hollow(12). The impact portion is formed by an incline(11c) which connects a front flat surface(11a) and a rear flat surface(11b) to be inclined. The front flat surface and the rear flat surface have difference in height. The hollow reduces thickness and is formed to compensate strength reduction due to thickness reduction. The hollow is formed between the front flat surface and the rear flat surface.
