Abstract: A wheelchair includes a main body having a main frame with two rear wheels, a connecting frame securely connected to two side frames of the main frame, and a steering/driving device. The steering/driving device includes a handlebar, a connecting member, a wheel frame connected to the handlebar, a front wheel rotatably mounted to the wheel frame, and a transmission mechanism. The connecting member includes a first end securely connected to a front end of the connecting frame and a second end pivotally connected to the handlebar. The transmission mechanism includes a transmission block and a transmission gear device. The transmission block is securely connected to the handlebar. The transmission gear device is coupled with a shaft of the front wheel. The wheelchair is moved forward when a user in the wheelchair manipulates the handlebar back and forth while providing a steering function of the wheelchair.