PURPOSE: To obtain a swivel fluid joint which can facilitate the extension work without increasing the cost of an existing fluid joint.

CONSTITUTION: In, a rotary fluid joint composed of cylindrical members 7b which are rotatable relative to each other and a shaft member 7a fitted therein, a fluid passage being formed therebetween, one end of the cylindrical members 7b is closed by one end part of lid members 7c, and is extension shafts 8b and an extension cylinders 8e formed therein fluid passages are connected to the cylindrical members 7b and the shaft member 7a.