To propose a meandering control device capable of quickly and accurately correcting deviative travel and meandering of a belt of a belt conveyor.

This belt conveyor is formed by tensioning the belt between a driving pulley and a tail pulley, and is constituted so that a movable support frame rotatably supported in a plane of a tension belt is arranged in a tail pulley part of this belt conveyor, and the tail pulley is journaled and stored in its movable support frame, and a support frame rotating mechanism is connected to the rear side of this movable support frame.