This movement-guiding device 10 comprises: a moving rail 21 including a rolling element rolling surface 23; a first block 22 that engages with the rolling element rolling surface 23 of the moving rail 21 via a plurality of rolling elements; a fixed rail 31 including a rolling element rolling surface 33; a second block 32 that engages with the rolling element rolling surface 33 of the fixed rail 31 via a plurality of rolling elements; and a joint member 40 which is formed in a plank shape and which connects the moving rail 21 and the fixed rail 31 by having the first block 22 mounted on one surface and having the second block 32 mounted on the other surface, the joint member 40 being formed having a height difference. As a result of having such a configuration, this movement-guiding device 10 can be mounted in a limited space.