The invention relates to a device (1) for coupling equipment to a rail in a vehicle, said device (1) comprising both a main body (2) designed to be attached to the rail, and a connecting member (3) attached to the main body (2) and designed to be connected to said equipment, said device (1) being characterized in that the connecting member (3) comprises, as a minimum, both a first plate (4) mounted movably on the main body (2), and a first adjustment means (8) designed to allow a user to adjust, by manipulating the first adjustment means (8), the position of the first plate (4) relative to the main body (2).