Wheelchair structure

Disclosed is a wheelchair structure, comprising a seat with a bottom to which front and rear wheels are mounted, a seat cushion mounted on the seat, a foot support pivoted to a front end of the seat, a back pivoted to a rear end of the seat, a back cushion attached to and covering the back, and armrests on opposite sides of the seat. The seat has an upper frame that is height-adjustable by means of a driving device and support frames. A driving device and a link member are coupled between the back and the foot support for inducing simultaneous movement thereof. Bottoms of the seat cushion and the back cushion are both slidable in the transverse direction and the back cushion is also slidable in the longitudinal direction. The seat forms a cutoff that can accommodate a toilet bowl. As such, the wheelchair is capable of what is not able to function, allowing a wheelchair sitter to move within a larger distance and space.