Electric motor driven adjustable mattress has a shared casing accommodating a flat cushion element of a cushion structure and an electric motor driven adjustable support apparatus for supporting cushion element. Support apparatus has two support parts adjustable relative to one another, and on their sides facing cushion element are provided with spring elements elastically resiliently supporting cushion element. For adjusting the support parts, an electric motor driven drive apparatus is in shared casing. In each case two support parts of support apparatus adjustable relative to one another are connected via a pivot axis. Support apparatus has two bending and folding axes spaced apart from along longitudinal direction of support apparatus and situated so that for folding mattress, support parts together with cushion element on it may be folded together； in folded state extension of the mattress in its longitudinal direction is smaller than in the unfolded state.
