PURPOSE: To protect a power supply means from breakdown by prohibiting rotation of turn table when power receiving means and power supply means are opposing at predetermined positions in an unmanned vehicle provided with the turn table.

CONSTITUTION: An unmanned vehicle 1 comprises a body 3 and a turn table rotatable with respect to the body 3. The turn table 2 is provided with a pair of driving wheels 4a, 4b. Optical communication units 24, 23 are provided, respectively, on the body 3 and on the ground. A power supply coupler 14 on a coupler drive unit 15 is coupled with a power receiving coupler 12 thus feeding power. Upon completion of power supply, the power supply coupler 14 moves in the direction of an arrow C and actuates a limit switch 22. That state is then transmitted through the optical communication units 23, 24 to a controller 7 in order to allow rotation of the turn table 2. If the limit switch 22 does not function, rotation of the turn table 2 is prohibited.