Abstract: A transport means for transporting pieces three-dimensionally, wherein the sections belonging to a section pair (1.sup.1, 1.sup.2, 4.sup.1, 4.sup.2) are box-like; a traction member (14.sup.1, 14.sup.2 ; 16.sup.1, 16.sup.2) has been disposed over its essential length inside the section (1.sup.1, 1.sup.2 ; 4.sup.1, 4.sup.2) and secured to the carriage with a tension means (31); and the transport means comprises return sheaves (15; 17), which have been placed in pairs, spaced at the distance of the section, with the carriage (2.sup.1, 2.sup.2 ; 5.sup.1, 5.sup.2) between the return sheaves; and the traction member has been disposed to run from the carriage over the return sheaves back to the respective carriage for forming a closed loop of the traction member and the respective carriage; and a power means (3, 6) has been arranged to move the traction member and by its mediation, the respective carriage.