Provided is a guiding apparatus having a structure in which a metal collision noise is reduced and a shear load due to the action of a stopper is less likely to be applied in a stopper for preventing a rail such as an inner member from falling off in the assembled state of the guiding apparatus. The guiding apparatus includes a first member having a sliding groove formed along a longitudinal direction; and a plurality of second members which are slidably assembled along the sliding groove so as to hold the first member in between, wherein the first member is formed with a first mounting hole on a bottom surface of the sliding groove, and the second member is formed with a second mounting hole on a surface opposed to the bottom surface, and wherein a stopper member is mounted to each of the first mounting hole and the second mounting hole, each of the stopper member having an insertion part which is to be inserted into each of the first mounting hole and the second mounting hole and is formed to be shorter in a length in an axial direction than a depth of the first mounting hole and the second mounting hole, and a protruding part protruding from each of the bottom surface and a surface opposed to the bottom surface, respectively.