To provide a vacuum unit capable of enhancing working efficiency at exchange of a filter.

In the vacuum unit, plural unit bodies are connected. The vacuum unit is further provided with a filter cover 27 provided in every unit body and covering the whole of a side surface of a filter case 15 provided with an opening part 20c of a filter chamber for storing the filter 14. The filter cover 27 is constituted so as to be engaged with all piping port members 26 for closing the opening part 20c of the filter chamber.