PURPOSE: To efficiently unload a bulk cargo, by providing a horizontal screw conveyer in a goove formed across the entire width of a hold, near a bulkhead of a ship's bottom, and connecting a vertical conveyer leading to an upper deck with a discharge conveyer leading to a broadside.

CONSTITUTION: There is provided a groove 8 near a bulkhead 5 of a ship's bottom 4 over the width of a hold 3, and is arranged in the groove 8 a screw conveyer 9 having a lead angle oppositely directed from its central portion. A vertical conveyer 12 leading to an upper deck 7 is vertically arranged at the central portion of the screw conveyer 9, and a discharge conveyer 13 leading to a broadside is connected through a shoot 12a to the vertical conveyer 12. Thus, a bulk cargo in the hold may be continuously and efficiently unloaded.