BOOM DEVICE OF VEHICLE FOR HIGH LIFT WORK

PURPOSE:To provide a boom device for a vehicle for high lift work capable of improving the operability of the operation for directing a working upper rotary base to the prescribed direction of a high lift work position and capable of improving the workability. CONSTITUTION:This boom device for a vehicle for high lift work is constituted of a lower rotary base 5 provided rotatably against a vehicle body 8, an expandable boom 4 provided derrickably from the center of the lower rotary base 5, an upper rotary base 3 rotatably provided at the tip of the boom 4, a lower encoder 14 detecting the rotation angle of the lower rotary base 5, an upper encoder 13 detecting the rotation angle of the upper rotary base 3, and a control device equalizing the moving rotation angle of the lower rotary base 5 and the moving rotation angle of the upper rotary base 3 based on the values from the lower encoder 14 and the upper encoder 13.