Hoist device for dump truck

Provided is a hoist device for a dump truck, which is simpler in configuration and less expensive than conventional devices. One three-position switching valve is used as a main control valve (35) for controlling a hoist cylinder (4). A control valve (49) is provided for supplying hydraulic pressure from a low-pressure hydraulic pressure source during vessel lowering to a rod chamber (4b) of the hoist cylinder (4). Between the rod chamber (4b) of the hoist cylinder (4) and an oil tank (21) is provided a non-return valve (13) capable of supplying working oil from the oil tank (21) to the rod chamber (4b) during a vessel-raising action. When an action command of an operation device is a vessel-lowering command, a controller (54) switches the main control valve (35) to the raising position, and switches the control valve (49) for the vessel-lowing action to supply low-pressure working oil from the low-pressure hydraulic pressure source to the rod chamber (4b) of the hoist cylinder (4). 本发明提供种自卸卡车的举升装置，与以往相比结构简单且