guide can have a simple shape moreover the reinforcing plate 20 can be produced simply by press punching accordingly the movable guide in accordance with the invention is advantageous in terms of accuracy production cost and ease of assembly and automated assembly can be carried out the movable guide is mounted on an inner wall of an engine by an attachment means p inserted through the elongated mounting hole 12 b in the guide body 10 and the circular mounting hole 21 in the reinforcing plate 20 when the movable guide is used in a high temperature environment even if the guide body 10 and the reinforcing plate 20 have different coefficients of thermal expansion shape deformation which is liable to occur in the guide is avoided because the ends of the guide body 10 and the reinforcing plate 20 remote from the mounting holes 12 b and 21 are free to move relative to each other in the longitudinal direction of the guide therefore deformation and breakage of the guide due to thermal effects are avoided although the invention has been described with specific reference to a movable guide used with a tensioner many of the advantages achieved in a movable guide in accordance with the invention can be realized in a fixed guide having a similar mounting hole structure even if a the relative positions of the guide body and the reinforcing plate shift during the mounting of the guide an attachment means such.