Support device, adjustable by an electric motor, for the padding or seating of reclining furniture, in particular the mattress of a bed, comprising: a base body including support parts (6 - 14) on which the padding is supported during use of the support device, the support parts (6 - 14) comprising at least one stationary first support part and a second support part which is pivotably adjustable relative to the first support part about a pivot axis, and a drive device for adjusting the second support part relative to the first support part, the second support part being designed and configured so that the pivot axis is supported so as to be translationally movable in the longitudinal direction of the support device and the second support part being in drive connection with the drive device such that during the pivoting adjustment the second support part at least in phases simultaneously performs a translational movement away from the first support part, during the translational movement the second support part or a component connected to the second support part runs onto a first positioning element and thereby pivots and a slide is provided, on which the pivot axis is supported, and which is translationally movable by the drive device, characterised in that the second support part is in drive connection with the drive device in such a way that during the whole adjustment movement between a non-adjusted starting position, in which the second support part together with the first support part spans a horizontal or approximately horizontal support plane, and an end position of the adjustment movement, the second support part simultaneously performs both a pivoting movement and also a translational movement. a base body including support parts (6 - 14) on which the padding is supported during use of the support device, the support parts (6 - 14) comprising at least one stationary first support part and a second support part which is pivotably adjustable relative to the first support part about a pivot axis, and a drive device for adjusting the second support part relative to the first support part, the second support part being designed and configured so that the pivot axis is supported so as to be translationally movable in the longitudinal direction of the support device and the second support part being in drive connection with the drive device such that during the pivoting adjustment the second support part at least in phases simultaneously performs a translational movement away from the first support part, during the translational movement the second support part or a component connected to the second support part runs onto a first positioning element and thereby pivots and a slide is provided, on which the pivot axis is supported, and which is translationally movable by the drive device, characterised in that the second support part is in drive connection with the drive device in such a way that during the whole adjustment movement between a non-adjusted starting position, in which the second support part together with the first support part spans a horizontal or approximately horizontal support plane, and an end position of the adjustment movement, the second support part simultaneously performs both a pivoting movement and also a translational movement.