A light irradiation device for dental implants, which is capable of reliably performing a required ultraviolet ray irradiation treatment to screw type dental implants, is provided. The light irradiation device for dental implants irradiates screw type dental implants with ultraviolet rays wherein each of the screw type implants has a screw part comprising a spiral protrusion. The light irradiation device comprises a casing, a stage that is provided within the casing, in which the plurality of dental implants are disposed and held so as to be aligned in one direction, and an ultraviolet ray irradiation lamp that is disposed within the casing, wherein the entire surface of the protrusion that forms the screw part of each of the plurality of dental implants held on the stage is irradiated with the ultraviolet rays emitted from the ultraviolet ray irradiation lamp.
