To provide technology capable of translating a vehicle in a lateral direction relative to its travel direction without steering front wheels and rear wheels of the vehicle in a lateral direction of 90.

The front wheels 100a, b and the rear wheels 100c, d are mutually turned to a reverse phase side at an arbitrary angle by steering drive devices 12a, b, c, d capable of independently turning the front wheels 100a, b and the rear wheels 100c, d respectively, and the front wheels 100a, b and the rear wheels 100c, d are mutually rotated to a reverse phase side at arbitrary rotation torque by rotation actuators 14a, b, c, d capable of independently driving the front wheels 100a, b and the rear wheels 100c, d respectively. Thereby, the vehicle is translated in a vertical direction relative to a linear travel direction of the vehicle along a traveling surface.