The present invention relates to a photocatalyst unit. More particularly, the photocatalyst unit includes a body made of a plate with openings at upper and lower sides thereof and having one or more pairs of opposing lamp fixing means provided therein ultraviolet radiation lamps each coupled to the lamp fixing means a photocatalyst member coupled to the body and having a surface coated with a photocatalyst, wherein the photocatalyst member includes a plurality of plates disposed orthogonally to the ultraviolet radiation lamps, wherein the plates are disposed parallel to a flow direction of air and spaced to each other in order to form gaps between adjacent plates and photocatalyst filters each disposed on upper and lower sides of the photocatalyst member and mounted on the body to cover upper and lower sides of the body, wherein the photocatalyst filters are applied with a photocatalyst.
