PURPOSE: To conduct excavation work and sieve work efficiently at the same time by vibrating an inner frame body installed into a bucket body through a cushioning material by a vibrating body such as a vibrovibrating body.

CONSTITUTION: An inner frame body 3 housed into a bucket body 2 with at least both side walls, and penetrating sections are distributed and formed to the lower section, etc., of the circumferential wall of the inner frame body 3. A cushioning material such as a vibration-proof rubber is disposed between the internal surface of the side wall of the bucket body 2 and the external wall of the inner frame body 3. A vibrovibrating body 6 rotating a pair of shafts with eccentric weights in the opposite direction is installed on the outside of the upper wall or the rear of the circumferential wall of the inner frame body 3. A cylinder vibrating body alternately changing over electromagnetic changeover valves by electrically generated pulses and vibrating a piston may also be mounted in place of the vibrovibrating body 6. The inner frame body 3 is vibrated in the bucket body 2 by the vibrating body 6, and the sieve operation of a substance to be excavated is conducted.