The invention relates to devices for transporting goods and people on stairs and flat surfaces and, in particular, to occupied wheelchairs. The transportation device comprises a frame, to which a seat for accommodating an individual is secured from above, and a lifting mechanism. Individual longitudinal horizontal guides are fastened to the front, the back, the left and the right of the frame respectively, each guide having an angular wheel support secured thereon in such a way as to be movable in a longitudinal horizontal direction, and a drive for the longitudinal horizontal movement of the support along the frame in order to adjust the length of the longitudinal base between the axles of a pair of crosspieces.
