PURPOSE: To provide a material for a light diffuser having characteristics in that the image of a light source cannot be seen through it and the luminosity is uniform without reducing the brightness of the light source, the light diffuser being used as lighting covers and various displays.

CONSTITUTION: Provided are fine solid silicone resin particles which satisfy simultaneously the following conditions: the particle size distribution range is 0.5-10μm; the number-average particle size is 2-5μm; the proportion of the particles of 1-6μm is 90% or more based on all the particles; and the half-value width of the particle size distribution is 2μm or less. The light-diffusing resin composition is prepared by dispersing 1-5 pts.wt. of the fine particles in 100 pts.wt. of a transparent resin. When its molding in the form of a 2-mm thick flat sheet is placed in front of a fluorescent tube light source illumination, it shows the characteristics of a luminance distribution ratio of 0.8 or more and a total light trnsmission of 60% or more. Thus, there can be obtained lighting commodities through which the image of a light source cannot be seen and which do not impair the brightness of the light source.