This invention discloses a tool chucking device for chucking a tool of the handpiece of the cartridge. Handpiece according to the present invention comprises a head having a bore, is mounted so as to rotate in the bore of the head and the cartridge having a bore, and the tool is engaging groove is formed on the upper surface is fitted in the bore of the cartridge, the cartridge has a gear attached to the outer surface. The clamp is mounted to rotate between the unloading position for releasing the clamping of the clamping position and a clamping tool for clamping the tool in the bore of the pivot head, and a second arm that extends from the first arm and the first arm to have, a stumbling block to the underlying alignment stopping groove is formed in the clamping position to the end of the second arm. The locking spring has an obstacle in the locking groove and a gear group to confer an elastic force in a direction in which the alignment has a ring to bond to accommodate the second arm, so that the inlet portion and the ring gear on one side to accommodate the second arm is formed . Pushbutton is pressed, the line is attached to the first arm in the bore of the head. The return spring imparts a spring force so that the push button is returned to the initial position. According to the present invention, is an obstacle to clamp the locking groove of the tool group alignment and chucking clamp, by rotating the clamp by the operation of the push-button can be easily release the chucking of the tool. Further, the clamp is to improve the assembly performance by a simple structure in which rotation between the clamping position clamping the unloading position, there is an effect that it is possible to reduce the production costs.본 발명은 카트리지에 공구를 척킹하기 위한 핸드피스의 공구 척킹장치를 개시한다. 본 발명에 따른 핸드피스는 보어를 갖는 헤드와, 헤드의 보어에 회전할 수 있도록 장착되어 있고 보어를 갖는 카트리지와, 카트리지의 보어에 끼워지며 외면 상부에 걸림홈이 형성되어 있는 공구와, 카트리지의 외면에 장착되어 있는 기어를 갖는다. 클램프는 헤드의 보어에 피봇을 중심으로 공구를 클램핑하는 클램핑 위치와 공구의 클램핑을 해제하는 언클램핑 위치 사이를 회전
