Lifting device, in particular a lying surface height adjusting device, for adjusting the height of at least one lying surface zone of a lying surface of a bed system, wherein the respective lying surface zone extends in a longitudinal direction of the lying surface only across a part of the entire lying surface length of the lying surface and extends in a transverse direction, extending perpendicularly to the longitudinal direction of the lying surface, of the lying surface across the entire lying surface width of the lying surface, - having at least one lifting unit which is assigned to precisely one lying surface zone and which has at least one lifting element pair having two hydraulic or pneumatic lifting elements which are connected to one another via at least one crossbeam, - having a control device which has at least one pump device for conveying a fluid and a valve device, - having a plurality of fluid lines for the fluid coupling of the lifting elements to the control device, - having an actuating device for the manual actuation of the lifting device, - wherein the respective crossbeam extends substantially across the entire lying surface width and has a left end portion assigned to a left side of the lying surface and a right end portion assigned to a right side of the lying surface, - wherein in the respective lifting element pair, the one lifting element forms a left lifting element arranged on the left end portion, while the other lifting element forms a right lifting element arranged on the right end portion, - wherein an actuation for lifting the respective lying surface zone is carried out such that the lifting elements of the lifting unit assigned to this lying surface zone are pumped up such that the lifting elements of the respective lifting element pair lift the associated crossbeam, - wherein an actuation for lowering the respective lying surface zone is carried out such that the lifting elements of the lifting unit assigned to this lying surface zone are relaxed, such that the lifting elements of the respective lifting element pair lower the associated crossbeam, - wherein for at least two different lying surface zones is provided respectively one such lifting unit, - wherein the actuating device and the control device are configured such that the at least two lifting units can be controlled independently of one another for raising and lowering the respectively assigned lying surface zone, characterised in - that at least one such lifting unit has several lifting element pairs, - that in the respective lifting unit which has several lifting element pairs, all left lifting elements are fluidically connected so as to communicate with one another and are coupled fluidically to the control device via a common fluid line, and - that in the respective lifting unit which has several lifting element pairs, all right lifting elements are fluidically connected so as to communicate with one another and are coupled fluidically to the control device via a common fluid line. - having at least one lifting unit which is assigned to precisely one lying surface zone and which has at least one lifting element pair having two hydraulic or pneumatic lifting elements which are connected to one another via at least one crossbeam, - having a control device which has at least one pump device for conveying a fluid and a valve device, - having a plurality of fluid lines for the fluid coupling of the lifting elements to the control device, - having an actuating device for the manual actuation of the lifting device, - wherein the respective crossbeam extends substantially across the entire lying surface width and has a left end portion assigned to a left side of the lying surface and a right end portion assigned to a right side of the lying surface, - wherein in the respective lifting element pair, the one lifting element forms a left lifting element arranged on the left end portion, while the other lifting element forms a right lifting element arranged on the right end portion, - wherein an actuation for lifting the respective lying surface zone is carried out such that the lifting elements of the lifting unit assigned to this lying surface zone are pumped up such that the lifting elements of the respective lifting element pair lift the associated crossbeam, - wherein an actuation for lowering the respective lying surface zone is carried out such that the lifting elements of the lifting unit assigned to this lying surface zone are relaxed, such that the lifting elements of the respective lifting element pair lower the associated crossbeam, - wherein for at least two different lying surface zones is provided respectively one such lifting unit, - wherein the actuating device and the control device are configured such that the at least two lifting units can be controlled independently of one another for raising and lowering the respectively assigned lying surface zone, characterised in - that at least one such lifting unit has several lifting element pairs, - that in the respective lifting unit which has several lifting element pairs, all left lifting elements are fluidically connected so as to communicate with one another and are coupled fluidically to the control device via a common fluid line, and - that in the respective lifting unit which has several lifting element pairs, all right lifting elements are fluidically connected so as to communicate with one another and are coupled fluidically to the control device via a common fluid line.