To restrain required power for carrying a carrying object in a manufacturing line.

Rails 111 are arranged along the manufacturing line. A driving roller 204A and a driven roller 204B are arranged along the carrying direction by the rails 111. The driving roller 204A rotates in the direction for carrying a carriage 102 placed on the rails 111 in the carrying direction by a motor 202. A belt 205 is extended to a rotary shaft of the driving roller 204A and a rotary shaft of the driven roller 204B.