To provide a self-advancing skate board by which one can plays stating in the same feeling with an ordinary skate board.

Front wheels 11 and rear wheels 12 are fixed to the rear face of a deck 1 through support structures 13, 14. The support structures 13, 14 allows the deck 1 to incline in accordance with an eccentric load acting on the right or left side of the deck 1 and have a steering function controlling the front wheels and the rear wheels. An electric motor 2 driving the rear wheels 12, a battery 3 supplying electric power to the electric motor 2, and a control circuit box 4 controlling the motor 2, are attached to the rear face of the deck 1. And also an angle sensor detecting the inclined angle of the right and left sides of the deck 1 is attached to the rear face of the deck 1. The driving control circuit equipped in the circuit box 4 outputs a control signal to generate a larger driving power as the eccentric load is large in accordance with the detected signal from the angular sensor to drive the electric motor 2.