To improve convenience, to facilitate access to a cargo, and to store a mounting device using the entire baggage compartment, by separating materials, tools, and sub-materials from each other for storage in the baggage compartment of a working vehicle.

This baggage compartment is partitioned 7 into an upper stage and a lower stage with a flat using a top end of a tire house. The materials can be orderly loaded on the upper stage. The lower stage is divided into one or two, drawers 14 achieving to the depth are freely pushed or pulled on rails 3 arranged on a floor, and the tools and the sub-materials are stored in them. The mounting device also can be similarly pushed or pulled using the rails 3.