Mounting means for optical fibre with reinforcement for groove lamination

Fastening device for fastening a light conductor (10) by inserting the fastening device into a groove (35), preferably of a vehicle interior, light conductor device and method for mounting a light conductor, wherein the fastening device has a receiving part (20) with an elongated hollow section (21) for receiving the light conductor (10) and an overhang (22) extending away from the hollow section (21) when viewed in cross-section, wherein the overhang (22) is a stable fastening element (25) or is connected to such a fastening element, which can be partially or completely inserted into the groove (35) and holds the fastening device in the groove.