Adjusting device having a spindle drive for a seat element of a vehicle seat

An adjusting device for a seat element of a vehicle seat supporting a body part of a seat user, with at least one driving device comprising a spindle drive and at least one adjustable support element for changing the contour or position of the seat element, wherein the spindle drive comprises a spindle extending along a spindle axis, which is floatingly mounted at a spindle end via a spindle holder, wherein the spindle holder comprises a first and a second compensating element for a displaceability of the spindle end with respect to two first and second spatial directions extending approximately perpendicularly to each other and each perpendicularly to the spindle axis, and wherein the spindle end is displaceably held on the first compensating element and the first compensating element together with the spindle end is displaceably held on the second compensating element.