Lifting device for beds, in particular for patient and nursing beds, - having a first leg (7a, 8a, 9a) which can be telescoped and a second leg (7b, 8b, 9b) which can be telescoped, which in each case have a stationary lower leg part (7a, 7b) and an upper leg part (9a, 9b) which is movable in relation to the former, - having at least one cross member (5, 6, 10) which interconnects the legs (7, 8, 9), - having a rotational drive (19, 20, 30 to 35) for the simultaneous length adjustment of the legs (7, 8, 9) of the lifting device, - having a first traction means and a second traction means, - wherein a first end (17, 27) of the first traction means or of the second traction means, respectively, is attached to the lower end of the upper leg part (9b, 9a) of the second leg (7b, 8b, 9b) or of the first leg (7a, 8a, 9a), respectively, - wherein a second end (18, 28) of the first traction means or of the second traction means, respectively, is at least indirectly attached to the upper leg part (9b, 9a) of the first leg (7a, 8a, 9a) or of the second leg (7b, 8b, 9b), respectively, and - wherein the first traction means and the second traction means intersect one another in the region between the first leg (7a, 8a, 9a) and the second leg (7b, 8b, 9b), - wherein the lifting device has a first group of deflection rollers (12 to 16) and a second group of deflection rollers (22 to 26), - wherein the first traction means is assigned the first group of deflection rollers (12 to 16) and the second traction means is assigned the second group of deflection rollers, - wherein, by means of the rotational drive (19, 20, 30 to 35), the first traction means or the second traction means, respectively, is drawable from the first leg (7a, 8a, 9a) to the second leg (7b, 8b, 9b) and vice-versa, so as, on account thereof, to displace the upper leg parts (9b, 9a) of the legs upwards or downwards in relation to the lower leg parts (7a, 7b), characterized in that the legs (7a, 8a, 9a; 7b, 8b, 9b) in each case have a central leg part (8a, 8b) which is in each case movable in relation to the lower leg part (7a, 7b) and the upper leg part (9a, 9b), that the first group of deflection rollers (12 to 16) comprises a third deflection roller in the region of the lower end of the central leg part of the second leg, and that the second group of deflection rollers (22 to 26) comprises a third deflection roller in the region of the lower end of the central leg part of the first leg. - having a first leg (7a, 8a, 9a) which can be telescoped and a second leg (7b, 8b, 9b) which can be telescoped, which in each case have a stationary lower leg part (7a, 7b) and an upper leg part (9a, 9b) which is movable in relation to the former, - having at least one cross member (5, 6, 10) which interconnects the legs (7, 8, 9), - having a rotational drive (19, 20, 30 to 35) for the simultaneous length adjustment of the legs (7, 8, 9) of the lifting device, - having a first traction means and a second traction means, - wherein a first end (17, 27) of the first traction means or of the second traction means, respectively, is attached to the lower end of the upper leg part (9b, 9a) of the second leg (7b, 8b, 9b) or of the first leg (7a, 8a, 9a), respectively, - wherein a second end (18, 28) of the first traction means or of the second traction means, respectively, is at least indirectly attached to the upper leg part (9b, 9a) of the first leg (7a, 8a, 9a) or of the second leg (7b, 8b, 9b), respectively, and - wherein the first traction means and the second traction means intersect one another in the region between the first leg (7a, 8a, 9a) and the second leg (7b, 8b, 9b), - wherein the lifting device has a first group of deflection rollers (12 to 16) and a second group of deflection rollers (22 to 26), - wherein the first traction means is assigned the first group of deflection rollers (12 to 16) and the second traction means is assigned the second group of deflection rollers, - wherein, by means of the rotational drive (19, 20, 30 to 35), the first traction means or the second traction means, respectively, is drawable from the first leg (7a, 8a, 9a) to the second leg (7b, 8b, 9b) and vice-versa, so as, on account thereof, to displace the upper leg parts (9b, 9a) of the legs upwards or downwards in relation to the lower leg parts (7a, 7b), characterized in that the legs (7a, 8a, 9a; 7b, 8b, 9b) in each case have a central leg part (8a, 8b) which is in each case movable in relation to the lower leg part (7a, 7b) and the upper leg part (9a, 9b), that the first group of deflection rollers (12 to 16) comprises a third deflection roller in the region of the lower end of the central leg part of the second leg, and that the second group of deflection rollers (22 to 26) comprises a third deflection roller in the region of the lower end of the central leg part of the first leg.