A device for automatically adjusting the working width of a first plough body of a plough in accordance with the variable working width of subsequent plough bodies (112, 113), a beam of each plough body (111, 112, 113) being attached to a rear frame section, pivotal around a second vertical pivoting axis and being connected to a parallel rod which is anchored to a front frame section via a lateral-displacement section, in which a first hydraulic cylinder is arranged to displace the rear frame section laterally relative to the front frame section, the first hydraulic cylinder and two parallel rods (1181, 1182) forming a connection between the front frame section and the rear frame section, and a second hydraulic cylinder is forming a connection between the rear frame section and the lateral-displacement section and is arranged to pivot the rear frame section around a first vertical pivoting axis provided in the connection between the front frame section and the rear frame section in order thereby to adjust a transverse spacing of the plough bodies (111, 112, 113) by the plough bodies (111, 112, 113) pivoting around second vertical pivoting axes, characterized in that the first hydraulic cylinder is a multi-stage cylinder in which a first cylinder stage forms a main lateral control, and a second cylinder stage, extending from inside the first cylinder stage, forms an automatic working-width control for the first plough body, the second cylinder stage being in hydraulic-fluid communication with the second hydraulic cylinder in a master-slave configuration, the second cylinder stage being the master or the slave depending on the moving direction of the cylinder stage and the second hydraulic cylinder correspondingly being the slave or the master, and the piston diameters (D 1a, D 2) of the second cylinder stage and the second hydraulic cylinder being matched to each other so that an adjustment of the working width of the plough bodies (111, 112, 113) by the second hydraulic cylinder provides a correction of the lateral displacement of the front frame section, and the first hydraulic cylinder being connected to the rear frame section in front of the first vertical pivoting axis. the first hydraulic cylinder is a multi-stage cylinder in which a first cylinder stage forms a main lateral control, and a second cylinder stage, extending from inside the first cylinder stage, forms an automatic working-width control for the first plough body, the second cylinder stage being in hydraulic-fluid communication with the second hydraulic cylinder in a master-slave configuration, the second cylinder stage being the master or the slave depending on the moving direction of the cylinder stage and the second hydraulic cylinder correspondingly being the slave or the master, and the piston diameters (D 1a, D 2) of the second cylinder stage and the second hydraulic cylinder being matched to each other so that an adjustment of the working width of the plough bodies (111, 112, 113) by the second hydraulic cylinder provides a correction of the lateral displacement of the front frame section, and the first hydraulic cylinder being connected to the rear frame section in front of the first vertical pivoting axis.