A wheel chair includes two pedals, two transmission devices, two clutch members and two control units. Each transmission device includes a driving unit, a clutch unit and a rear wheel driving unit. Each of the clutch units includes an intermediate disk and a driving disk which is co-rotatably connected with the intermediate disk. Each of the rear wheel driving units is connected between the rear wheel and the intermediate disk. Each clutch device includes a shifter which controls the clutch disk to be disengaged from the intermediate disk. The control units each control the clutch disk to be engaged with the intermediate disk so as to connect the rear wheels with the force from the driving units so as to rotate the patients legs counter clockwise.
