To provide an unmanned search vehicle which implements the search in a planet outside the earth or on a deep sea bottom, etc., and has the function of recovering to the original normal attitude when the vehicle is toppled while traveling on an uneven ground.

A flywheel 6 is provided rotatably on the line of the center of gravity of a vehicle body, a second flywheel 10 is provided rotatable with intervals from the line of the center of gravity, a means to rotate the second flywheel at high speed is provided, and a mechanism to recover the attitude of the vehicle body with one end of the vehicle body as a supporting point by the reaction torque generated by the ratio of rotation of the flywheel 6 and the second flywheel 10 is provided.