To provide a sterilization and deodorizing system by an ultraviolet light source and an ultraviolet active photocatalyst.

A sterilization and deodorizing apparatus is formed by simultaneously combining the sterilization effect of ultraviolet ray and the deodorizing effect given by a photocatalytic material, using a composite photocatalyst capable of achieving the activation of the photocatalyst efficiently with the excited light of 254 nm ultraviolet wave length (photon energy 4.9 eV) by dispersing photocatalytic particles composited by adding an inorganic oxide or the like into a photocatalytic material containing titanium dioxide or the like as a main component in a medium.