Abstract: The present invention relates to an output gear, a wheel and a driving device for an electric scooter, and to the electric scooter. The output gear for an electric scooter comprises a gear having teeth and tooth spaces, an external spline securely connected to the center of a gear face of the gear, wherein the external spline has external spline teeth and external spline tooth spaces, shaft holes are defined in centers of the gear and the external spline. The gear directly outputs torque after speed reduction to the wheel by means of a connection structure of the external spline and the internal spline, so that a final output is more stable, the problem in a conventional electric scooter that the rotation of the scooter's wheel is affected due to a clearance between the output shaft and the wheel is alleviated, the speed reduction precision and sensitivity are consequently improved.