A device for fixing elongated bodies to a supporting cable includes a body containing a seat for the supporting cable and a seat for the elongated body, wherein, for the independent closing of the seats, a lid is provided that closes the seat of the supporting cable and a lid that closes the seat of the elongated body. A device according to the invention offers the advantage of not requiring the perfect positioning of the coaxial wire with respect to the supporting cable by having a distinct or separate system for fixing the device onto the coaxial wire and supporting cable, respectively. Another advantage of a device according to the invention lies in its autonomy because it does not require additional elements for consolidating the installation.