Floor of a vehicle for load carrying

A floor (1,30) of a vehicle (2, 31) for load carrying, for example a commercial vehicle, an industrial vehicle and like, which has a uniquely simple construction, comprises a plate-like flat structure (4) mounted on the vehicle main frame (3,32), wherein the plate-likeflat structure (4) comprises a board (5,33) formed of three layers (6,7,8), with a middle layer of cellular matrix, and a framework (14) forming a portion of the main frame.