To improve light transmissivity and light diffusion without losing an original tone by using a sheet made of a transparent resin as a main component, containing white fine particles not melted by its forming temperature and containing white fine particles each having a particular form and a particle distribution for indicating a particular chromaticity coordinates

A tone holding sheet is made of a transparent resin as a main component so as to be prevented from being melted by its forming temperature, formed in a roughly cubic shape and contain more than one kind of white type fine particles with weight average particle diameter set to within the range of 0.1 to 30μm. The measured value of the chromaticity coordinates of a transmitted light using a JIS/Z-8720 standard light source satisfies the following two expressions: 0.001≤1xL-xT1≤0.015... (1), 0.005≤1yL-YT1≤0.02... (2). Herein, xL and yL are the chromaticity coordinates of the standard light source, xT and YT are the chromtiacity coordinates of the transmitted light of the sheet. Preferably, in the JIS/Z-8720 standard light source, measuring of the chromaticity coordinates of a reflected light satisfies the following expression: 0.005≤1xL-XR1$0.03, 0.005←L-yR1$0.035. Herein, XR≤yR is the chromaticity coordinates of the reflected light of the sheet.