Abstract: A wheelchair which utilizes a standing frame assembly which includes an arm rest frame which may be formed integrally or detachably mountable on the wheelchair, and a holding lever is pivotally mounted on the frame between a lower position and a raised position in which it is arranged in front of and above the seat of the wheelchair. A ground engaging member is movable under the action of the movement of the lever, so that it can be moved between a retracted position with the lever in its lower position and a ground engaging position in front of the wheelchair when the lever is in its raised position. A locking device is provided to lock the ground engaging member and the lever when the latter is in its raised position.