Disclosed herein is an ultraviolet irradiation device for removing organic contaminants from implants using ultraviolet rays. In the present invention, the implants can be easily and smoothly put into or pulled out of a processing chamber, and the implants can be reliably prevented from being recontaminated after the ultraviolet irradiation process has finished. For this, the ultraviolet irradiation device includes a housing provided with an openable door, an ultraviolet lamp installed in the housing, a carriage provided in the housing so as to be extractable, and an implant mount unit placed on the carriage in such a way that the implant mount unit can be disposed facing the ultraviolet lamp in the housing. The implant mount unit includes a mounting board removably placed on the carriage, and an implant support removably placed on the mounting board.