The increase of ultraviolet radiation caused by the destruction of the ozone layer produces various health problems related to human bodies such as skin cancer and cataract. Along with the increase in outside activities, the number of people who work in exteriors is also increasing. The ultraviolet reflectance and transmittance of the building material are one of the important factors of ultraviolet radiation in and out of building. In this research, the ultraviolet spectral reflectance of many kinds of building material is measured, and their relationships with visible ray reflectance are discussed in different wavelength bands. Also, the relationships with the lightness, roughness, and chromaticity, which are surface characteristics, are discussed. From the measurement results, the ultraviolet reflectances on Wood are about Visible 55-68%, UV-A 7-12%, and UV-B 4-5%. Wall Tiles are about Visible 18-40%, UV-A 8-20%, and UV-B 7-8%. Concrete is about Visible 37%, UV-A 28%, and UV-B 19%. The ultraviolet reflectance can be estimated by visible reflectance. As material lightness becomes higher, ultraviolet reflectance also becomes higher.
