Disclosed are a tool chuck having improved operation reliability and durability and a handpiece equipped with the same. The disclosed tool chuck comprises: a socket having a circular pipe shape； a clamp inserted in the socket to be closely fixed to the inner circumferential surface of the socket, having a tool opening formed in the front end center thereof to enable a tool to be inserted therein, and equipped with a plurality of elastic projections formed in the rear end thereof to be elastically biased towards the tool inserted through the tool opening； and a sliding member inserted in the socket, disposed in the rear of the clamp to be able to forwardly and backwardly slide and move with respect to the socket, and having a sloped surface contacting the elastic projections. The elastic projections have tool adhering surfaces formed on the inner surfaces thereof so that the outer circumferential surface of the tool is adhered and pressed and the tool is fixed to not be separated from the clamp. When the sliding member is forwardly pressed to be forwardly moved with respect to the socket, the elastic projections are pushed and spread by the slope surface so that the tool adhering surface is separated from the outer circumferential surface of the tool. When pressure applied to the sliding member is released, the elastic projections are elastically restored so that the tool adhering surface adheres and presses the outer circumferential surface of the tool. Also, the sliding member is pushed by the elastic projections to be backwardly returned with respect to the socket.작동 신뢰성 및 내구성이 향상되는 공구 척(tool chuck)과, 이를 구비한 핸드피스가 개시된다. 개시된 공구 척은, 원형 파이프(pipe) 형상의 소켓(socket), 소켓에 삽입되어 소켓의 내주면에 밀착 고정되는 것으로, 전단부 중앙에 공구가 삽입되는 공구 개구가 형성되고, 후단부에 공구 개구를 통해 삽입된 공구를 향하도록 탄성 바이어스(elastic bias)된 복수의 탄성 돌기를 구비한 클램프(clamp), 및 소켓에 삽입되고, 소켓에 대해 앞뒤로 미끄러지며 이동 가능하게 클램프의 후방에 배치되며, 복수의 탄성 돌기에 접촉되는 경사면이 형성된 슬라이딩 부재(sliding member)를 구비한다. 복수의 탄성 돌기는 그 내측면에 공구의 외주면을 밀착 가압하여 공구를 클램프에 대해 분리되지 않게 고정하는 공구
