The present invention relates to an attachment device of a dental structure, capable of absorbing an impact caused by an external force by providing a buffer space between a protrusion unit of an intermediate member and a cap member. The attachment device of a dental structure of the present invention comprises: the cap member having an appearance corresponding to a coupling hole to be fixed to the inside of the coupling hole formed in the dental structure, having a first accommodation space, which is downwardly opened, formed therein, and having a stop protrusion protruding from the inner surface thereof formed therein； the intermediate member accommodated in the first accommodation space of the cap member and having a second accommodation, which is downwardly opened, formed therein； and an abutment including an upper coupling unit and a lower coupling unit, wherein the upper coupling unit is inserted into the second accommodation space of the intermediate member to be detachably coupled to the intermediate member, and the lower coupling unit is disposed in a lower side of the upper coupling unit and coupled to any one of an alveolar bone or a dental fixture. The intermediate member includes an upper surface unit facing an upper end of the upper coupling unit of the abutment and a side surface unit extending down from an edge of the upper surface unit. The side surface unit has a protrusion unit formed on an outer surface thereof, wherein the protrusion unit upwardly extends while contacting the inner surface of the cap member. The protrusion unit includes a concave portion, which is inwardly caved in and separated from the inner surface of the cap member, to form the buffer space between the protrusion unit and cap member.본 발명은 치과용 구조물의 부착장치에 대한 것으로서, 더욱 상세하게는 치과용 구조물에 형성된 결합공 내에 고정될 수 있도록 상기 결합공과 대응되는 외형을 가지며, 내부에는 하측으로 열려진 제1수용공간이 마련되고, 내면으로부터 돌출된 걸림돌기가 형성된 캡부재； 상기 캡부재의 제1수용공간 내에 수용되는 것으로, 내부에는 하측으로 열려진 제2수용공간이 마련된 중간부재； 및 상기 중간부재의 제2수용공간 내에 삽입되어 상기 중간부재에 착탈가능하게
