PURPOSE: To attain the mass production of a light conductive plate with high and satisfactorily uniform luminance, and having thin thickness and uniform quality by a die molding method.

CONSTITUTION: The light conductive plate 7 uses a diffusion plane diffusing the light introduced from at least one side end surface as an emitting plane and made of a transparent plate in which one plane is formed as a light diffusion plane 2 and the other plane opposite the light diffusion plane is formed as a reflecting plane 3. In the light conductive plate 7, one of the opposed planes is formed to a flat plane, and the other plane is formed to an inclined plane whose plate thickness is decreased as separating from a light introduction side end face, and a large number of projections 5 expanding gradually as separating from the light introduction side end face are provided on one side of the flat plane or the inclined plane, and also, the tip surface 6 of the projections 5 is formed to a coarse surface. The plate 7 is formed integrally by the die molding method.