stable magnetic fluids are holding the rotating joint that allows it to offer . The rotary shaft 10 with a first passage 11, the housing 20 with the second passage 21, is secured to the outer circumference of the rotating shaft 10, the first annular groove 51 and the second annular groove 52 to the third passage 53, the first annular member is provided (50) in communication, is fixed to the inner periphery of the housing 20 and the third annular groove 61 and the fourth annular groove 62, communicating to the fourth passage 63, the second annular member is provided (60), being provided on both sides of the axial direction of the first annular member 51 and the second annular member 52, the rotary shaft 10 as the housing 20, rotating the joint with the magnetic fluid seal 40, a pair of sealing an annular gap between a and 1, the first passage 11, second passage 21, the third passage ( 53) and the fourth passage 63, regardless of the rotational position of the rotating shaft 10 with respect to the housing 20, they will be characterized in that is arranged at a position that the surge increase in a straight line.
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