There is described a wheelchair (1), in particular a manual wheelchair for bariatric or heavy-duty use, comprising a wheelchair chassis (30), a seating area (10), a backrest (20), as well as front wheels (45) and rear wheels (40), said backrest (20) comprising a backrest frame (21) supported onto the wheelchair chassis (30). According to the invention, the wheelchair (1) further comprises a rolling support structure (60) provided at a rear portion of the wheelchair (1) to support the wheelchair (1) in an upright position in which the wheelchair (1) is tilted back and is supported by the rolling support structure (60) to allow displacement of the wheelchair (1) in the upright position. The rolling support structure (60) includes at least three, in particular four, rolling elements (61, 62) providing rolling support for the wheelchair (1) in the upright position. The rolling elements (61, 62) preferably provide omnidirectional rolling support for the wheelchair (1) in the upright position, and may in particular be ball casters