PURPOSE: To stop an unmanned vehicle at a predetermined position by starting deceleration at a predetermined deceleration if the speed of the vehicle is a maximum speed immediately when a member to be detected to start deceleration is detected, or starting the deceleration after it is accelerated to a target speed if it is not the maximum speed.

CONSTITUTION: The distance between dogs DS1-DS3 for stopping and dogs DR1-DR3 for starting decelerations is set to a distance necessary to be decelerated to a speed to be immediately stopped by a braking operation if traveling unmanned vehicles 4A-4C at the maximum speed are traveled at a predetermined deceleration from the dogs DR1-DR3 for starting the deceleration. A CPU judges whether the speed command value is the maximum speed or not when it reaches the dogs DR1-DR3. If the speed command value is the maximum speed, a deceleration command is immediately output, while if it is not the maximum speed, the acceleration command is output until it becomes the target speed, and then the deceleration command is output. When a sensor detects the dogs DS1-DS3 for stopping, the CPU outputs a stop command to a traveling motor.