To provide a safe and low-cost meandering prevention conveyor belt to be used for a long time without wasting conveying energy and without providing a belt stopper on a side of a rotating roller by automatically eliminating lateral displacement of the belt during conveying operation to return the belt to the center even in the case wherein bias-conveyance of the conveyed material is caused, and capable of avoiding a fall of the conveyed material.

The rotating rollers for supporting the conveyed belt 2 and provided with an interval in the conveying direction are respectively formed of at least two rollers 3 and 3 provided in a direction crossing the conveying direction, and diameter of the two rollers 3 and 3 is formed into a truncated cone shape so as to be enlarged from the center part to the ends.