To enable setting change of a conveying distance according to the layout of the site to be applied, and smooth conveyance of workpieces.

Dividual horizontal conveying parts 16a, 16b are connected by a connection board 120 and a support column 22, and the respective rails 28 of the horizontal conveying parts 16a, 16b are connected without steps and gaps. A connection conveying vehicle 12 is conveyed by receiving force through a chain pressing board 242 with the respective annular chain 30 for the horizontal conveying of the horizontal conveying part 16a, 16b. When the backmost part of the chain pressing board 242 separates from the annular chain 30 for horizontal conveying of the horizontal conveying part 16a, the chain pressing board 242 of the headmost first conveying vehicle 200 reaches the annular chain 30 for the horizontal conveying in the horizontal conveying part 16b, and the connection conveying vehicle 12 is continuously conveyed.