To provide a small-size pipe connection changeover device changing over the connection form of a pipe comprising a plurality of fixed side pipe connection parts and two or more moving side pipe connection parts by a simple structure.

This pipe connection changeover device is provided with a plurality of fixed pipe connectors 20 being disposed in a row with their axes in parallel to one another, two or more movable pipe connectors 30 being connected to the fixed pipe connectors 20 by being coaxially set thereto and pressurized against them, and a drive mechanism A having a moving means A1 capable of moving the movable pipe connectors 30 along the row and axial moving means A2 capable of pressurizing them toward the fixing pipe connectors 20. This device is also provided with a chuck 50 detachably attaching the movable pipe connectors 30 to the drive mechanism A.