Vehicle seat and commercial motor vehicle with a vehicle seat

The invention relates to a vehicle seat (1), in particular a commercial vehicle seat (1A), with a seat part (2), with a backrest (3) comprising a backrest lower part (16) and a backrest upper part (17), and with a holding device (25), by means of which the backrest upper part (17) is supported displaceably relative to the backrest lower part (16), wherein the holding device (25) has a sliding guide device (26; 126; 526), by means of which the backrest upper part (17) is arranged displaceably relative to the backrest lower part (16) along a displacement curve (27), in order to support the backrest upper part (17) displaceably at least partially beyond the side edge (4A, 4B) of the backrest lower part (16).