PURPOSE: To improve the assembling/fitting precision and increase the work efficiency by constructing and outfitting a bridge and part of a poop deck mounting the bridge in one unit on the ground.

CONSTITUTION: Only a bridge deck 4 mounting a bridge 1 is separated from a hull structure 5, the bridge deck 4 used as a base and the bridge 1 are connected in one unit on the ground, fittings such as boat davits, a funnel, and a radar mast are fitted, pipelines are fitted, testing and the thermal insulation work is also performed, and furthermore, cables are installed. The bridge deck 4 connected in one unit and fitted on the ground is mounted and assembled at a predetermined position of the hull structure 5 of a ship with a crane, etc. Accordingly, the assembling/fitting precision is improved, and the work efficiency as a whole can be increased.