Photometric properties of sphere paints such as cellulose lacquer paints and carboxy-methyl-cellulose paints have been investigated. As the result, the following was made clear:(1) Even the same kinds of pigments have different values in reflection factor varying with different lots of their makers.(2) The hiding power of sphers painte seems to be lower at longer wavelengths than at shorter ones.(3) Diffusing characteristics of surfaces coated with sphere paints are influenced by particle sizes of the surfaces and these sizes depend on the process of coating. That is, these characteristics are not always inherent in the kinds of sphere paints.(4) The paint with MgO as a pigment is inferior to the others in durability for moisture. Spectral reflection factor of every sphere paint tested decreases much in the shorter wavelength region in an indoor exposure test.