To easily load and unload articles in a transport by piling up articles such as an tray for automated storage and retrieval warehouses on a truck for transport in multiple stages and in a plurality of rows.

A positioning member 47 for regulating the four corners of the articles (tray for working) 6 is mounted to the truck 6 so that it can be freely pulled out and inserted. When the article 6 is to be loaded, the article 6 is guided by each positioning member 47, thus easily performing loading work. When the piled up articles 5 are to be taken out of the truck 7 for transport, a grip 43 in the article 5 at the lowest stage is gripped and lifted as it is by extracting the positioning member 47.