Light transmission body

Provided is a light transmission body which has a good balance among excellent durability, wear resistance, lubricity and excellent adhesiveness. A light transmission body according to one embodiment of the present invention comprises a fiber strand and a covering layer. The fiber strand is configured of: a core that is formed of glass; and a cladding that covers the outer circumferential surface of the core and is formed of glass. The covering layer is composed of a plurality of alkyl groups which cover the outer circumferential surface of the cladding and are not substituted by fluorine, and each alkyl group is bonded to the cladding via a siloxane bond. 本发明提供兼顾优异的耐久性、耐磨损性和润滑性与优异的粘接性的光传输体。实施方式的光传输体包含纤维线材和被覆层。纤维线材由芯和包层构成，该芯由玻璃构成，该包层被覆上述芯的外周面且由玻璃构成。被覆层由被覆上述包层的外周面且未经氟取代的2个以上的烷基构成，上述各个烷基藉由硅氧烷键与上述包层连接。