The invention provides a conveying device (1) which is particular in that the conveying device comprises a plurality of conveying elements (2), where each conveying element (2) comprises a chain box element (4) in which at least one transport roller (3) is rotatably fixed such that rollers (3) arranged in adjacent conveying elements (2) define the conveying device transport plane, and that chain box elements (4) of adjacent conveying elements are interconnected in such a way that one conveying element may articulate in relation to adjacent conveying elements, and that at least some of the chain box elements in the conveying device comprise drive means directly engaging and rotating the transport rollers (3).