Abstract: An apparatus for cutting at a bevel a piece presents a reference surface with respect to which the plane of cut must be inclined, by the desired angle.The apparatus comprises two parallel, vertical side elements in which are respectively provided two slots for guiding a saw blade, these two slots being parallel and opening in the edges of the side elements to define the plane of cut. Means are provided for connecting the two parallel, vertical side elements to maintain them at a distance from each other along a common transverse axis. A support is mounted on each side element so as to be orientable about the transverse axis and presents an upper bearing face. The two parallel, upper bearing faces define a bearing plane for the reference surface of the piece to be cut. Means are provided for blocking each support on the side element associated therewith so that its bearing face forms with the slot of the corresponding side element, an angle equal to the desired angle of cut.