An implant abutment capable of stably adjusting vertical dimension of occlusion, the implant abutment comprising: an upper coupling portion that is an upper portion coupled to an artificial tooth ; a lower coupling portion that is a lower portion coupled to a fixture ; an exposed portion that is a portion exposed to the outside between the upper coupling portion and the lower coupling portion , and an adjustment groove that is formed on an outer circumferential surface of the upper coupling portion and inwardly recessed in the upper coupling portion , wherein the adjustment groove includes: two side surface ; a bottom surface connecting lower ends of the two side surface ; a base surface that is in contact with inner sides of the two side surface and positioned opposite to an entrance portion of the adjustment groove , and an imaginary surface positioned at the entrance portion of the adjustment groove , wherein among four edges of the side surface , a top edge thereof is formed to be shorter than a bottom edge thereof, and the base surface extends to be inclined toward the imaginary surface as the base surface goes in a direction from a surface of the upper coupling portion that faces the artificial tooth to a surface of the upper coupling portion that faces the fixture , characterized in that the base surface obliquely extends with an inclination angle of 2 to 7° with respect to an imaginary vertical line extending vertically from an edge of the base surface positioned close to the artificial tooth , and the imaginary surface obliquely extends with an inclination angle of 7 to 12° with respect to an imaginary vertical line extending vertically from an edge of the base surface positioned close to the artificial tooth , wherein the inclination angle of the imaginary surface is larger than that of the base surface . an upper coupling portion that is an upper portion coupled to an artificial tooth ; a lower coupling portion that is a lower portion coupled to a fixture ; an exposed portion that is a portion exposed to the outside between the upper coupling portion and the lower coupling portion , and an adjustment groove that is formed on an outer circumferential surface of the upper coupling portion and inwardly recessed in the upper coupling portion , wherein the adjustment groove includes: two side surface ; a bottom surface connecting lower ends of the two side surface ; a base surface that is in contact with inner sides of the two side surface and positioned opposite to an entrance portion of the adjustment groove , and an imaginary surface positioned at the entrance portion of the adjustment groove , wherein among four edges of the side surface , a top edge thereof is formed to be shorter than a bottom edge thereof, and the base surface extends to be inclined toward the imaginary surface as the base surface goes in a direction from a surface of the upper coupling portion that faces the artificial tooth to a surface of the upper coupling portion that faces the fixture , characterized in that the base surface obliquely extends with an inclination angle of 2 to 7° with respect to an imaginary vertical line extending vertically from an edge of the base surface positioned close to the artificial tooth , and the imaginary surface obliquely extends with an inclination angle of 7 to 12° with respect to an imaginary vertical line extending vertically from an edge of the base surface positioned close to the artificial tooth , wherein the inclination angle of the imaginary surface is larger than that of the base surface . <EOS>