PURPOSE: To improve responsiveness by including an oscillation sensor equipped in a coil car and a controlling means to stop the coil car when an oscillation amplitude has become larger than a predetermined value while the coil car responds to an output of the oscillation sensor and moves.

CONSTITUTION: When the coil car 1 runs as a material to be loaded such as a coil 8 is loaded on the coil car 1, the coil 8 being the loaded material collides with a payoff reel drum, etc., and when its collision force acts on the coil car, the oscillation of the coil car 1 is detected by the oscillation sensor 15. When the amplitude, etc., of the oscillation has become larger than a predetermined value, the coil car 1 stops running. As a result, before the material to be loaded such as the coil is converted on the coil car, the collision of the material to be loaded can be detected and the coil car is stopped at once. In this way, the material to be loaded is prevented from being converted on the coil car and beforehand from falling from the coil car.