To provide a connecting structure of a vacuum evacuation device capable of suppressing pressure loss due to piping, and saving space and reducing costs.

Vacuum evacuation devices (1A, 1B) respectively include pump chambers (21A, 21B, 22A, 22B) and intake ports (31A, 31B) and/or exhaust ports (41A, 41B) in communication with the pump chambers. A connecting structure of the vacuum evacuation devices is constructed so that at least one pump chamber (22A) of one vacuum evacuation device (1A) and at least one pump chamber (21B) of the other vacuum evacuation device (1B) are in direct communication with each other when the vacuum evacuation devices are disposed in direct contact with each other.