the invention relates to a fastening device for an elongated object , in particular a cable tree , having a holder intended for attachment of the elongated object and an adjacency surface for the elongated object , and having a fastening element connectable to the holder for fastening the holder to a part . for connection of the holder to the fastening element , a plug - in assemblable snap coupling is provided , closable by a force directed against the adjacency surface of the holder .