To provide an abutment having a detent that makes it easy to adjust unsteadiness, an abutment (12) has a tubular shape, one end of which is to be fixed to an implant fixture, and another end of which is to be fixed to a dental prosthesis, wherein a protrusion (14) that is a belt-like protrusion extending in a circumferential direction is formed around an outer circumference of the abutment in a side to be fixed to the dental prosthesis, and a cut portion (14a, 14b) of a smaller protrusion amount is formed on at least each of two regions of the protrusion.
