The present invention can be combined to be hand-held, each comprising a case in the form of rods and case parts The spindle structure according to the vibration of the handpiece that is configured to include a drive unit is inserted into the inside consisting of a drive shaft extending in the forward direction of the motor so that the transmission of rotational power to the motor and a motor for generating a rotational force, is connected to the drive shaft of the drive unit provided that the connecting shaft rotational force is transferred and the rotating shaft that rotates in conjunction with the connecting shaft installation and chuck housing is formed extending forward direction from the axis of rotation is coupled to the distal end of the collet chuck housing to be installed at the same time be linked with the housing chuck chuck rotation bearing unit including a set of front and rear bearings are provided with a bearing for supporting the rotating shaft portion fitted to surround the spindle is provided outside the drive shaft so as to be fitted to surround the outside of the drive unit for transmitting a rotational force to the rotating shaft spindle unit including a set of the The front bearing and a rear bearing bearing portion is formed in a cylindrical shape so as to be fixed to the inside of each of the two sides to accommodate fixed bearing cover is installed jidoe made of, ever be sandwiched provided to surround the drive shaft and the spindle portion of the outer rotational shaft drive section Front and rear bearing bearing bearing parts, each locking jaw so that the drive shaft and the axis of rotation jams are formed, so that the bearing parts of the front and rear bearings, each bearing is accommodated in the inner sides of the bearing fixed on both sides of the cover is fixed to the inner bearing fixed cover characterized by a fixed jaw formed inside each of the two sides.본 발명은 손으로 파지 가능하도록 각각 결합되어 봉 형태로 케이스부를 포함하여 구성되고 케이스부의 내부에 삽입되어 회전력을 발생시키는
