The invention concerns a spindle drive for the motorized adjustment of an adjusting element of a vehicle, comprising a drive motor with a motor shaft, a speed reduction gear mechanism, and a feed gear mechanism, the speed reduction gear mechanism having a planetary gear mechanism and the feed gear mechanism being designed as a spindle/spindle nut gear mechanism, the planetary gear mechanism having a rotatable sun gear and coaxially in relation thereto a rotatable planet-gear carrier and a fixed or fixable ring gear, and the planet-gear carrier carrying at least one rotatable planet gear, which is in axially parallel engagement with the sun gear on the one hand and the ring gear on the other hand, the drive motor, the speed reduction gear mechanism and the feed gear mechanism being accommodated one behind the other in a substantially elongate drive housing and aligned with a common longitudinal drive axis.