Provided are: a light-diffusing plate for a liquid crystal display device which plate can give an assured or improved luminance with assured light-diffusibility, suppress itself from dimensional changes caused by moisture absorption, and also prevent the device from deterioration caused by ultraviolet light generated from a lighting unit; and a polycarbonate resin composition for a light-diffusing plate which has both high light transmittivity and light-diffusibility and is excellent in flame retardancy. The present invention is a light-diffusing plate for a liquid crystal display device which plate has a lamination structure comprising two or more kinds of plastic layers; said lamination structure having at least two layers of which are different from each other in refractive index.