Abstract: A movable working platform comprises a scaffold including a front frame having a pair of support posts, and a pair of front wheels mounted on opposite sides of a lower end of the front frame, a rear frame having a pair of support posts, and a pair of rear wheels mounted on opposite sides of a lower end of the rear frame. A scaffolding platform is disposed between the front and rear. A steering mechanism of the platform includes a steering shaft vertically arranged along the front frame, a handle mounted on an upper end of the steering shaft, and a drive wheel mounted on a lower end of the steering shaft. A drive mechanism of the platform includes a pedal swingably supported by the front frame, a wire member wound on a pulley and reciprocally moved in response to a swinging motion of the pedal, and a one-way clutch for transmitting only a one-way rotation of the pulley to the drive wheel.