A device for sterilizing container closures includes a transport device which transports the container closures along a predetermined transport path (P), an enclosure, which surrounds the transport device at least in sections, and a light source, which applies ultraviolet radiation (S) to the container closures during the transport thereof along the transport path (P). The light source is disposed outside the enclosure, and the ultraviolet radiation is conducted into the interior of the enclosure.
