A sealing device is composed with a slinger 11 which is installed to one member among relatively rotating two members, a lip member 21 which is installed to the other member, wherein the slinger 11 integrally has a tubular portion 12 which is fitted to the one member and a flange portion 13 which extends in a diametrical direction. Said lip member 21 is provided with an attachment ring 22, and a rubber-like elastic body 31, wherein the rubber-like elastic body 31 integrally has an attached rubber portion 32, an end face lip 33 which is supported to the attached rubber portion 32 and slidably comes into close contact with the flange portion, and a radial lip 34 which is supported to the attached rubber portion 32 slidably comes into close contact with an outer peripheral surface of the tubular portion 12. A bent portion 14 protruding in an axial direction toward the lip member 21 is provided in the flange portion 13 positioned in an inner peripheral side of the end face lip 33, wherein a second non-contacting lip 36 is provided by the rubber-like elastic body 31 of the lip member 21, so as to be positioned in an inner peripheral surface of a root portion of the end face lip 33 and to be arranged toward the bent portion and structured such that the second non-contact lip does not come into contact with said slinger 11. A labyrinth structure 41 having a minute gap is provided as a gap in an axial direction between the bent portion 14 and the second non-contacting lip 36. A lip end 35a is arranged between said bent portion 14 and the tubular portion providing a non-contact lip 35 structured such that the non-contact lip does not come into contact with the slinger 11. A labyrinth structure 42 having a minute gap is provided between the non-contact lip 35 and the slinger 11 in that the minute gap is provided in a diametrical direction between the non-contact lip 35 and the tubular portion 12, and also provided as a gap in a diametrical direction between the non-contact lip 35 and the bent portion 14, so that both gaps are continuously provided.