A device (20) for attaching a functional part (14) to a rail (5,6) of a drawer pull-out guide (3) includes a first bearing element (11) and at least one second bearing element (12), wherein the bearing elements (11, 12) are arranged in the front end area of the rail (5) and in the rear end area of the rail (5), wherein at least one clamping device (13) is provided, by means of which the at least two bearing elements (11, 12), in the installed position thereof on the rail (5), can be connected to each other and braced relative to each other.