PURPOSE: To enable a vehicle to carry different kinds of cargoes on outward and return trips, respectively, by pivotally mounting a cargo container which can dump, in the rear portion of a chasis and by providing an introduction port having an upper cover and for powder materials, and an opening having an inner cover and for a different kind of cargo on the top of the cargo container.

CONSTITUTION: A tank type cargo container 3 for conveying under pressure a powder material is mounted in the rear of a chasis, pivotably about a shaft 2, and is adapted to be tilted by a cylinder 4. A detachable upper cover 7 for hermatically closing an introduction port provided with an introduction bag 33, and another detachable upper cover 8 for opening and closing a vent port provided with a vent bag utilized upon the loading of a powder material are attached to the top of the cargo container 3. Further, a cargo receiving opening A is formed in the top of the cargo container 3, and is hermatically closed by an inner cover 15 from the inside of the cargo container 3. The rear portion of the cargo container 3 is provided with a mirror plate portion 35 which is opened or closed by a cylinder 38 and under which a pneumatically conveying and discharging mechanism 36 is disposed. Further a detachable inner cover 61 is provided in the inside of the mirror plate portion 35.