To obtain a setting system for increasing the degree of freedom of setting regardless of the size or setting place of a case.

A plurality of bar-shaped bodies 1 and a piece to be connected are used as a mechanism for connecting a plurality of cases set in parallel. The bar-shaped body is provided with connectors formed so as to be attachable/detachable to/from the piece to be connected at the both ends. The piece to be connected bodies is installed in the neighborhoods of the side face upper ends and lower ends of the cases of a device to be connected. The bar-shaped bodies are obliquely constructed between the upper end side piece to be connected of the two cases and the opposite lower end side piece to be connected of the cases.