Provided is an implant unit. The implant unit includes a fixture, which is assembled to an alveolar bone and includes a long hole formed in the depth-wise direction and having an opening on the top of the fixture； an intermediate structure, which is inserted to the long hole via the opening of the fixture； and an abutment assembled to the intermediate structure, wherein a first structure for coupling the fixture to the intermediate structure is formed on the inner surface of the fixture.
