To improve stopping accuracy of carried object when a unit conveyor is stopped.

At least two zones longer than the longitudinal length of the carried object are formed along a carrier direction. Each zone has a unit conveyor 3 having an endless carrier belt 7. A pair of front and rear idle rollers 10 are directly or indirectly rotatably provided on a pair of left and right side frames 5 so as to be located on one of an upper side or a lower side of a return path part 7b of the endless carrier belt 7 of each unit conveyor 3, to direct the axial center in the lateral direction with prescribed space in front and rear directions. A driving roller 20 is directly or indirectly rotatably provided on the side frames 5 so as to be located on the other, to direct the axial center in the lateral direction and to be located between the idle rollers 10. Either one of the driving roller 20 or the idle roller 10 is allowed to approachor separate to/from the other so that both of them may hold the return path part 7b of the endless carrier belt 7 or may not hold it.