The invention relates to a motor adjustable support device (2) of a seat and/or reclining furniture, especially for a bed mattress. Said support device has a base body (4) provided with laths (22, 24, 26, 28, 30). The support device also has support parts (8, 10, 12, 14) which can be adjusted relative to the base body (4) and an adjusting device for adjusting the support parts (8, 10, 12, 14) relative to the base body (4). According to the invention, at least one of the laths (22, 24) is hollow or is open on one side for receiving at least parts of the adjusting device. In another embodiment of the invention, at least one adjustment motor (32) pertaining to the adjusting device is located within the limits of a lath (22, 24) (side view). The inventive support device is especially low in height. Components pertaining to the adjusting device located in the laths (22, 24) are protected from damage and soiling. |