To improve the operation stability of an unmanned vehicle speed and also to miniaturize a device with respect to a controller of an unmanned vehicle.

A controller 10 that consists of a main controlling part, a travel controlling part, a steering correcting part and a speed commanding part gives a speed signal to travel based on an operation that should be performed by an unmanned vehicle, operates the deviated width and inclination of the unmanned vehicle with respect to a guidepath from signals that are detected by a sensor together with position correction quantity of the unmanned vehicle, gives speed information to servo drivers 27 and 28, controls a traveling speed of the unmanned vehicle and drives servo motors 4 and 6. The rotation speeds of the rotating servo motors 4 and 6 are detected by encoders 5 and 7 which are attached to the motors 4 and 6, feedbacked to a speed designating part of the controller 10 as a rotation speed signal and feedbacked to the travel controlling part as position and distance signals.