To favorably cause flow of fluid such as drinking water between relative rotation members while avoiding contamination.

This rotary joint 1 comprises an end surface contact type mechanical seal 7 provided with a first and a second seal rings 29 and 54 that are relatively rotatably slidable to connect a passage 5 formed in a joint main body 2 and a passage 6 formed in a rotary shaft body 3. The joint main body 2 is composed to be separable to a first joint main body part 9 having the passage 5, and a second joint main body part 10 to bearing-support the rotary shaft body 3. The mechanical seal 7 comprises a first mechanical seal component member 24 including the first seal ring 29, and a second mechanical seal component member 25 including the second seal ring 54. The first mechanical seal component member 24 is installed on the first joint main body part 9, and the second mechanical seal component member 25 is installed on the rotary shaft body 3 in a separate form from the first mechanical seal component member 24.