A dental abutment and a ceramics block for a dental prosthesis or a dental prosthesis cut from a ceramics block, wherein the ceramics block for dental prosthesis or the dental prosthesis cut from the ceramics block comprises an embedding hole (Ba) formed in advance at the ceramics block for a dental prosthesis or formed when cutting the ceramics block to be a dental prosthesis, and the dental abutment comprises: a gingiva contact part having a forward-thicker truncated conical shape on the intraoral side from a jawbone-side contact surface (1 a) being in contact with an intraoral-side end surface of an implant fixture; a fitting part provided projecting toward the jawbone side from the jawbone-side contact surface of the gingiva contact part, and which can be fitted into an end part on the intraoral side of the implant fixture so as not to rotate; and an embedded part being provided projecting toward the side opposite to the fitting part from the intraoral-side surface of the gingiva contact part and being embedded into the embedding hole (Ba), wherein the gingiva contact part, the fitting part and the embedded part are formed so that each center axis comes to be coaxial, wherein a through hole where a bolt which can be screwed into a female thread which can be screwed in the implant fixture which can be inserted to penetrate is formed so as to penetrate the fitting part, the gingiva contact part and the embedded part, wherein a step part being in contact with a head of the bolt is formed in the through hole, and a center axis of the through hole is provided to be coaxial with center axes of the gingiva contact part, the fitting part, and the embedded part, wherein three or more projecting line parts having a same shape are formed on an outer peripheral surface of the embedded part, wherein each of the projecting line parts starts from the end part on the side of the gingiva contact part, and its longitudinal direction is in parallel with the center axis of the embedded part, wherein each top part of the projecting line parts is in contact with a bottom part (Bb) of a concave groove formed in the embedding hole (Ba) when the embedded part is embedded into the embedding hole (Ba) of the ceramics block block, so that a uniform gap for a dental adhesive is formed along the approximately entire circumference between the inner surface (Bc) of the embedding hole (Ba) and the outer peripheral surface of the embedded part, and wherein the width of the gap for the dental adhesive is 5 to 100μm. a gingiva contact part having a forward-thicker truncated conical shape on the intraoral side from a jawbone-side contact surface (1 a) being in contact with an intraoral-side end surface of an implant fixture; a fitting part provided projecting toward the jawbone side from the jawbone-side contact surface of the gingiva contact part, and which can be fitted into an end part on the intraoral side of the implant fixture so as not to rotate; and an embedded part being provided projecting toward the side opposite to the fitting part from the intraoral-side surface of the gingiva contact part and being embedded into the embedding hole (Ba), wherein the gingiva contact part, the fitting part and the embedded part are formed so that each center axis comes to be coaxial, wherein a through hole where a bolt which can be screwed into a female thread which can be screwed in the implant fixture which can be inserted to penetrate is formed so as to penetrate the fitting part, the gingiva contact part and the embedded part, wherein a step part being in contact with a head of the bolt is formed in the through hole, and a center axis of the through hole is provided to be coaxial with center axes of the gingiva contact part, the fitting part, and the embedded part, wherein three or more projecting line parts having a same shape are formed on an outer peripheral surface of the embedded part, wherein each of the projecting line parts starts from the end part on the side of the gingiva contact part, and its longitudinal direction is in parallel with the center axis of the embedded part, wherein each top part of the projecting line parts is in contact with a bottom part (Bb) of a concave groove formed in the embedding hole (Ba) when the embedded part is embedded into the embedding hole (Ba) of the ceramics block block, so that a uniform gap for a dental adhesive is formed along the approximately entire circumference between the inner surface (Bc) of the embedding hole (Ba) and the outer peripheral surface of the embedded part, and wherein the width of the gap for the dental adhesive is 5 to 100μm.