Adjustment device for vehicle seats

An adjusting device for vehicles comprising at least one mounting plate and one support plate with a lifting device comprising at least two scissor mountings. The scissor mountings are each arranged at the longitudinal side edge or in a corner region of the mounting or support plate and are vertically adjustable via a drive unit. Each scissor mounting takes the form of double scissors and includes a first, lower scissor element and a second, upper scissor element which are connected to each other at one end via a common rotation pin. The lower scissor element is connected at the other end to the mounting plate, and the upper scissor element is connected at the other end to the support plate via fasteners.