Disclosed herein is a bicycle of the type driven by operation of a handle. According to the present invention, a shaft rod of the bicycle is installed with a hinge so as to enable the handle to rotate forward or backward. The handle is bent by a constant angle on the basis of the hinge, thereby being divided into both upper and lower portions on the basis of the hinge. The handle is formed at the lower portion thereof with an elongated guide bore, and a roller is inserted inside the guide bore so as to move upward and downward along the guide bore. The roller is connected to the upper end of a rod, which is installed so as to move upward and downward in a rectilinear course according to pulling and pushing operation of the handle.