In a liquid crystal display device, a light quantity control portion b 4a is formed to a dot shape by print or the like on a diffusion plate 4 interposed between lens sheets 3 and a light transmission member 5 on the side thereof near to a backlight source 8 composed of a cold cathode fluorescent lamp or the like. Since the dots of the light quantity control portion 4a have a light transmitting property to a certain extent, they reflect a part of the light from the backlight source 8 and permit the remaining light to pass therethrough. With this arrangement, there can be provided the liquid crystal display device capable of brightly and uniformly irradiating the entire surface of the effective display area of a liquid crystal panel from the backside thereof without emission lines.