To enable achievement of smooth raising/lowering operation of a boom while enabling to avoid the damage of a machine device even if an electric cylinder is used for a raising/lowering means of the boom.

A reclaimer 1A includes a machine body 11 having a travel means, a swivel base 12 horizontally arranged on the machine body 11 so as to be turnable, and a boom 13 extended from the swivel base 12, having a bucket wheel 15 at a tip side and performing the raising/lowering operation by a raising/lowering means 20, and performs pay-out while breaking down a stack by the bucket wheel 15, and is characterized in that the raising/lowering means 20 includes an electric cylinder 21 for operating by advancing and retracting a rod part 21b projected from a cylinder part 21a by the drive of an electric motor 21c, and reduces a shock in starting and braking by controlling the drive of the electric motor 21c by a control means having an inverter unit.