Abstract: The present invention provides a surface light source panel having superior brightness and uniformity of light. According to the present invention, diffused reflection sections are formed onto a transparent resin substrate by the printing of ink. Since the density of the diffused reflection sections and the area ratio thereof with respect to the transparent resin substrate, and also the containing ratio of additives in the ink are specified, the surface light source panel displays superior brightness and uniformity of light even when the substrate is a single plate which has ben laminated in a conventional panel. Moreover, although the surface light source panel of the present invention is provided with a light source at one end thereof, since the portion of the largest area ratio of the diffused reflection sections is arranged at a position deflected to the side of a reflecting part at the other end of the panel, the brightness and uniformity of the light can be more secured.