Abstract: An indoor wheelchair comprising a carriage with a seat having left, right, front and back edges, a backrest, four carrying wheels and supporting members connecting the seat to the carrying wheels; a left and a right riving mechanism mounted to the carriage, each driving mechanism including a manual driving wheel and a transmission connecting the manual driving wheel to one of the respective left and right carrying wheels, The wheelchair is characterized in that it is free of elements occupying the space under the seat between the innermost surfaces of the driving mechanisms and between the rear carrying wheels so that the wheelchair can be rolled over a common toilet bowl in backward motion, while the overall width of the wheelchair as defined between the outermost surfaces of the driving mechanisms allows passing to the wheel chair through a common bathroom door.