Adjustment apparatus for longitudinal adjustment of a vehicle functional assembly

An adjustment apparatus for longitudinal adjustment of a vehicle functional assembly comprises a guide rail which extends along a longitudinal axis, an adjusting assembly which can be adjusted on the guide rail along the longitudinal axis and is assigned to the vehicle functional assembly, and a cable assembly. It is provided here that the guide rail has a first supporting portion which extends along the longitudinal axis and a second supporting portion which extends along the longitudinal axis, wherein, as viewed along a transverse direction transversely with respect to the longitudinal axis, the first supporting portion is arranged on a first side of a portion of the adjusting assembly and the second supporting portion is arranged on a second side of the portion of the adjusting assembly, and the cable assembly is supported with a first portion on the first supporting portion and with a second portion on the second supporting portion.