An improved scooter includes a frame, a front wheel, a rear wheel, a stem, a handle, left and right pedal devices, and left and right first driving devices and second driving device. The left and right first driving devices are driven by the left and right pedal devices respectively for solely or jointly driving the second driving devices, and the driven second driving devices can drive the rear wheel to rotate and roll forward, such that the front and rear wheels can jointly drive the scooter to move forward. Users can pedal the pedal device(s) by one leg or both legs alternately to operate the scooter. The scooter not only complies with the simple, smooth, power-saving, stable and safe ergonomic design, but also comes with a unique operation and driving mode and achieves the effects of providing a recreational sport with fun as well as a transportation tool.