A wheelchair comprises a hub-enclosing open ring engaging a hub disposed in a wheel rotatably, bars extending from two ends of the hub-enclosing open ring, an crescent-shaped cap member fixed to the bars above the tube portion, a power handle engaging the crescent-shaped cap member rotatably through an L-shaped end of the power handle, a wheel-holding plate fixed to the power handle with an angle and covered by the crescent-shaped cap member. The wheel-holding plate comprises a holding edge for pressing down on and holding the wheel. The hub-enclosing open ring, the bars, and the cap member are fixed to one another and configured to rotate about the hub, and the holding edge of the wheel-holding pate is configured to be pressed down on and engaged firmly to the wheel such that the wheel rotates about the hub by pushing and pulling the power handle.
