PURPOSE: To provide a rotating joint for two kinds of fluid, which causes no fatigue of the slide rings of second slide ring sealing devices, is easy for high speed drying processing and does not interrupt the flow in a central passageway.

CONSTITUTION: Second slide ring sealing devices 10a, 10b, 11 are axially movable with respect to a housing 1 and a hollow shaft 2. The rotatable slide ring 10a is un-rotatably arranged in an internal bush 12 coaxially surrounding the hollow 2, coupling therewith and sliding axially thereon. Two un-rotatable slide rings 10b are arranged in an external bush 16 coaxially surrounding the internal bush 12 and slidable axially. The external bush has an annular piston 17 slidable into a cylindrical chamber 18 of the housing 1.