A fastening device for cables includes an edge clip part (20) for mounting the fastening device on an edge (10) of a base part, a metal piece (14) which is inserted into the edge clip part (20), a cable band lock (18), and a cable band (16) which is able to be introduced into the cable band lock (18). The metal piece (14) has a tongue (44) projecting into the cable band lock (18). The tongue (44) engages on the cable band (16) when the cable band (16) is introduced.