To surely change the direction of an object, with hardly oscillating the object in a left and right direction perpendicular to a carrying direction.

In this method, the direction of the object 2 is changed by imparting rotational force F3 to the object 2 carried by a differential speed conveyor 1 at different carrying speeds of high speed to low speed including stop and reverse direction carrying in the left and right direction Y by applying carrying speeds different in the left and right direction Y or/and direction carrying actions to the object 2, and imparting rotation promoting force F1 and F2 to both of a high speed carrying side Y1 and a low speed carrying side Y2 of the object 2 from the side.