A support apparatus adjustable by an electric motor for supporting padding of a seat and/or a reclining furniture, in particular a mattress of a bed, has a base body with an outer frame. Outer frame is configured and set up for resting on a support surface and an inner frame having at least two support parts adjustable relative to one another. Support apparatus has an electromotive drive apparatus with at least one adjustment element in drive connection with at least one electric motor, which for adjusting at least one support part is in drive connection with the electric motor. The outer frame is formed at least in sections by a C-shaped profiled rail. The C-shaped profiled rail forms a linear guide. The liner guide guides the adjustment element in the direction of the profile in a linearly displaceable manner.
