To provide a viscous fluid sealing damper capable of preventing vibration of an on-vehicle disc player and supporting it and omitting the insertion work for inserting a damper main body of a mounting shaft body into an insertion hole which has been conventionally difficult, and at the same time to solve a problem that a damping function is impaired because the shaft body moves relatively in the insertion hole during use.

In this viscous fluid sealing damper 16, the shaft body 20 is molded by providing an insertion part 46 into the insertion hole 44 in a stirring part 28 and a large-diameter part 48 forming a larger diameter than an outside diameter of the stirring part 28, positioned on more outer side in the axial direction than the insertion hole 44, and serving also as a mounting part having a close adhesion face 56 to an outer face of a flexible part 30 using a hard resin material. The stirring part 28 and the flexible part 30 are molded by a soft resin material. The shaft body 20 is integrally molded with the stirring part 28 and the flexible part 30 while the shaft body 20 is inserted into the insertion hole 44 and the large-diameter part 48 adheres closely to the flexible part 30 and is joined with it.