Filesg 27 [] A base member for an orthodontic implant device. The base member makes it possible to easily and reliably attach a correction implement. The base member is secured by a plurality of screws that are embedded in a bone inside an oral cavity. Each of the plurality of screws has a screw part that is embedded in the bone and a polygonal-columnar head part that is exposed 5 inside the oral cavity. The base member has at least three engagement holes that are provided so as to be capable of engaging the polygonal-columnar head parts and such that the centers thereof are not on the same straight line.
