Mounting structure to allow a production line made up of movable manufacturing devices to be rearranged quickly, safely, and reliably. The mounting structure according to the present invention includes a fixing structure installed on a floor and a leg portion installed on a bottom plate of the movable manufacturing device. The fixing structure comprises a floor side positioning member and a floor side coupling member while the leg portion comprises a leg side positioning member and a leg side coupling member. The floor side positioning member and the leg side positioning member positions the movable manufacturing device accurately by fitting each other when the device is placed at the specified location of the fixing structure. The floor side coupling member and the leg side coupling member fixes the movable manufacturing device located on the fixing structure by coupling each other.