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