To operate a wing vehicle for the multipurpose by freely mounting/ demounting an intermediate partition plate, by erecting plural partition stands composed of bilaterally symmetrically inclined support members in the longitudinal direction of the almost central part of a floor part so as to be freely mountable/ demountable, and fixing a trimming plate between the adjacent partition stands so as to be freely mountable/demountable.

Plural partition stands 34, 34... composed of bilaterally symmetrically inclined support members 32, 32 are erected in the longitudinal direction of the almost central part of the floor part 22 so as to be freely mountable/demountable. A trimming plate is installed between the adjacent support members 32, 32 so as to be freely mountable/demountable. When this is applied to the support members 32, 32 of the plural whole support stands 34, 34..., a bilaterally symmetrically inclined intermediate partition plate can be constituted between the inside surface of a front wall 24 and the inside surface of a rear door, but this intermediate partition plate can be freely mounted/demounted. Therefore, this vehicle can be used as an ordinary wing vehicle by fixing them by a load stack collapse preventive belt after being superposed on the inside surface of the front wall 24 by disassembling the whole support stands 34, 34... of the intermediate partition plate and the whole trimming plate.