A light guide plate for liquid crystal display, made of a resin, which has a surface layer portion (preferably on the light incident surface side of the light guide plate) comprising a region containing fluorine atoms in an amount larger than that in the inner layer portion. The resin is preferably an alicyclic structure-containing resin. The light guide plate is produced by exposing a surface of a light guide plate substrate to an atmosphere containing fluorine gas. Preferably, prior to the exposure to a fluorine-gas containing atmosphere and after the exposure to a fluorine-gas containing atmosphere, the light guide plate substrate is maintained in an inert gas-containing atmosphere, or in the air under reduced pressure, for the production of the light guide plate.