Mounting device for an oblong article, in particular wiring harness

A cable tree fastening device has a holder (1) for attaching an oblong object and a bearing surface for the oblong object. A fastening element (16) linked to the holder fastens the holder on a component. A snap-on coupler that plugs together links the holder to the fastening element. A locking pin (17) on the fastening element has a flange (19) to support a coupling part.