Abstract: A fastening device, e.g., for an electrical cable in a vehicle, has a sleeve which is lockable in a holder and which encloses the line. The sleeve has at least two sleeve subareas which are at least partially separable from one another in such a way that in a preinstalled state the line is inserted into an inner area of the sleeve, and the sleeve subareas are connectable to one another in such a way that in an installed state the line is completely annularly enclosed by the sleeve subareas. Due to the multipart configuration of the sleeve, it is easily mounted on a line. A resistant material such as a thermoplastic elastomer, which is processable with the aid of injection molding, is used for the sleeve.