The invention relates to a stand-up wheelchair comprising a frame (29) to which two drive wheels (30) and at least one steerable wheel (31) are fixed. A stand-up unit (33) provided with a height-adjustable seat (3), a back rest (7), and at least one foot rest (32), is pivotably arranged on said wheelchair. The inventive wheelchair is characterized in that the seat (3) is mounted, on both sides, on an articulation parallelogram structure consisting of an upper longitudinal rail (1) which is connected to the seat (3) in a fixed manner and comprises a front articulation point (10) and a rear articulation point (11), a lower longitudinal rail (2) comprising a front articulation point (12) and a rear articulation point (13), and two guides (4, 19) connecting the front articulation points (10, 12) and the rear articulation points (11, 13). The inventive wheelchair is also characterized in that the parallelogram structure can be displaced by a lifting device (36) in order to adjust the height of the seal (3).
