Lifting device, in particular a lying surface height adjustment device, for height adjustment of at least one lying surface area of a lying surface of a bed system, wherein the respective lying surface area extends in a longitudinal direction of the lying surface over only a part of the total lying surface length of the lying surface, and in a transverse direction of the lying surface, running transverse to the longitudinal direction of the lying surface, over the total lying surface width of the lying surface, - with at least one lifting unit, which is assigned to exactly one lying surface area and which has at least one lifting element pair that has two hydraulic or pneumatic lifting elements and a crossmember that extends parallel to the lying surface transverse direction and that connects the two lifting elements to one another, - with a control device, that has at least one pumping device for conveying a fluid and a valve device - with a plurality of fluid lines for fluidically coupling the lifting elements with the control device, - with an actuation device for manually actuating the lifting device, - wherein an actuation for raising the respective lying surface area occurs in that the lifting elements of the lifting unit assigned to this lying surface area are pumped up, so that the lifting elements of the respective lifting element pair raise the associated crossmember, - wherein an actuation for lowering the respective lying surface area occurs in that the lifting elements of the lifting unit assigned to this lying surface area are depressurised, so that the lifting elements of the respective lifting element pair lower the associated crossmember, - wherein the respective lifting element has an elastic bellows which, during pumping up, expands in a vertical direction running perpendicular to the lying surface and which yields in the vertical direction when depressurised, characterised in that - the respective bellows has an elastic bellows body which has an upper body part facing the crossmember and supported on the crossmember and a lower body part facing away from the crossmember, which are securely connected together along a body circumference, - the bellows body is designed such that, in a depressurised state of the respective lifting element, the body upper part lies flat on the body lower part inside the body circumference. - with at least one lifting unit, which is assigned to exactly one lying surface area and which has at least one lifting element pair that has two hydraulic or pneumatic lifting elements and a crossmember that extends parallel to the lying surface transverse direction and that connects the two lifting elements to one another, - with a control device, that has at least one pumping device for conveying a fluid and a valve device - with a plurality of fluid lines for fluidically coupling the lifting elements with the control device, - with an actuation device for manually actuating the lifting device, - wherein an actuation for raising the respective lying surface area occurs in that the lifting elements of the lifting unit assigned to this lying surface area are pumped up, so that the lifting elements of the respective lifting element pair raise the associated crossmember, - wherein an actuation for lowering the respective lying surface area occurs in that the lifting elements of the lifting unit assigned to this lying surface area are depressurised, so that the lifting elements of the respective lifting element pair lower the associated crossmember, - wherein the respective lifting element has an elastic bellows which, during pumping up, expands in a vertical direction running perpendicular to the lying surface and which yields in the vertical direction when depressurised, - the respective bellows has an elastic bellows body which has an upper body part facing the crossmember and supported on the crossmember and a lower body part facing away from the crossmember, which are securely connected together along a body circumference, - the bellows body is designed such that, in a depressurised state of the respective lifting element, the body upper part lies flat on the body lower part inside the body circumference.