PROBLEM TO BE SOLVED: To provide a bearing with magnetic fluid seal capable of surely keeping sealing of a rolling element part inside, and superior in productivity.SOLUTION: A bearing 1 with magnetic fluid seal is constituted by disposing a plurality of rolling elements 7 between an inner ring 3 and an outer ring 5, and holding a magnetic fluid by disposing a ring-shaped magnet 12 at an opening side of the inner ring and the outer ring to seal the plurality of rolling elements 7. The magnet 12 is magnetized so that magnetic pole is directed in an axial direction. Further a ring-shaped pole plate 14 is disposed while kept into contact with an axial outer side face of the magnet 12. Outer ring-side magnetic fluid 15a is held between the outer ring 5 and the magnet 12, and inner ring-side magnetic fluid 15b is held between the inner ring 3 and the pole plate 14.
