A supporting device adjustable by an electric motor and intended for supporting an upholstered unit of a piece of furniture for sitting and/or lying on, in particular for supporting a mattress of a bed. The supporting device has a main body and a supporting arrangement for supporting the upholstered unit and also an adjustment device for adjusting the supporting arrangement in respect of inclination and/or height relative to the main body. The adjustment device has at least one scissor-lift-like, Bowden-cable-actuable lifting arrangement, which acts between the main body and the supporting arrangement.
