A light shielding blade material is provided for an optical apparatus and has at least three prepreg sheets each being comprised of an epoxy resin of a thermosetting type as a matrix resin and containing a fiber drawn in an alignment direction within the matrix resin. These prepreg sheets are superposed upon each other so that the alignment directions of the fibers of the prepreg sheets disposed adjacent to each other cross at right angles to each other. The material has also two or more films each being comprised of an epoxy resin of a non-cured state as a base resin and containing 15 to 40 weight % of carbon black in the epoxy resin. These films are disposed to form a laminate of the prepreg sheets and the films so that the prepreg sheets contact one surface or both surfaces of each film. The laminate is applied with pressure and heat to cure the epoxy resin, such that the epoxy resin constituting the base resin of the film is diffused and integrated into the matrix resin of the prepreg sheet so that an interface between the base resin and the matrix resin disappears, and that the carbon black is dispersed from the base resin of the film to the matrix resin of the prepreg sheet.