A vehicle (1) includes at least one rear door (6, 8) with a rear spoiler device (14). The rear spoiler device includes an air deflector element (15, 25, 35, 45), which is adjustable between a basic position and a drive position for extending the contour and aerodynamic air deflection. The rear spoiler device further includes one support device (18, 28, 38, 48) for supporting the air deflector element (15, 25, 35, 45) in its drive position. The support device has a four-bar linkage (18, 28, 38, 48) with at least four joints or joint axes (A, B, C, D) for adjusting the air deflector element (15, 25, 35, 45) between the basic position and the drive position.