The light guide plate has at least two layers which are superposed on each other in the direction almost perpendicular to the light exit surface and contain the scattering particles at different particle concentrations, the scattering particles are polydisperse particles including a mixture of particles with different particle sizes, and the combined particle concentrations in each portion of the light guide plate is different by changing the thicknesses of the first layer and the second layer in the direction almost perpendicular to the exit surface.