PURPOSE: To shorten the time required for transportation, to reduce the frequency of enforcement works on the transportation route and to economize the transportation expenses by establishing a method to transport a pluraity of box-type cargoes concurrently in the form of a single unit by connecting the lower parts with a coupling device and by placing between the object upper parts members to be connected with each other under pressure and by supporting both edges of the combined units.

CONSTITUTION: The suspension ears 4 and 4 at the lower parts of transformers 1 and 1, which are box type objects to be transported, are connected to a single unit by coupling pins 5 and coupling fitments 6, which constitute a coupling device. In the upper parts, members 7 to be connected with each other under pressure are placed so as to manage a reactive force, making the two transformers a single unit when they are handled. This way a plurality of box type objects can be transported at a time as if they are in a single unit.