An abutment for an implant improves sealing with a fixture through the formation of a groove in a close adhesion portion. The abutment for an implant includes a screw portion, a close adhesion portion, and a head portion. The thread of a screw is formed in the screw portion so as to allow the abutment to be inserted into a fixture to be coupled by a screw. The close adhesion portion is tapered at the upper portion of the screw portion so as to be inserted into a taper portion of the fixture to come in contact with the same. The head portion is formed at the upper portion of the close adhesion portion to enable coupling of a prosthesis. The close adhesion portion has a plurality of grooves, which are formed along the circumference direction to reinforce the close adhesion with the tape portion of the fixture.
