Light diffusing device

A light diffusing device comprising (1) a light source member and (2) a light diffusing member which comprises (A) a base plate comprising (a) a transparent light transmitting layer having at least one light incident edge face thereof facing the light source member, (b) a light diffusing layer formed on a front surface of the transparent light transmitting layer, (c) an intermediate layer formed between the transparent light transmitting layer and the light diffusing layer and (d) a light reflecting surface layer formed on a rear surface of the transparent light transmitting layer;

• (B) a light diffusing plate superimposed over the base plate;
• and (C) a light reflecting film located between the light diffusing layer in the base plate and the light diffusion plate without being in contact therewith, and consisting of a transparent film substrate and light reflecting spots formed thereon in a pattern effective for reflecting portions of light irradiated from the light diffusing layer in such a manner that the amount of the light reflected by the light reflecting film decreases with an increase in distance from the light incident edge face, and thus the quantity of the light transmitted from the base plate to the light diffusing plate through the light reflecting film is evenly distributed.