A damping device

The invention relates to a damping device capable of preventing or suppressing bubbles from residing in a damping chamber in a manufacturing process. In the flange portion of a rotor in a damping chamber of the damping device with a bottom cylindrical housing, a front-side circularly annular end face becomes a conical surface inclined toward an outer circumferential side facing a direction far from the bottom of the housing. In the manufacturing process, viscous liquid is maintained in the housing and the housing is inserted from a bottom side according to a sequence of the shaft portion and the flange portion of the rotor. In that state, so long as the opening of the housing is arranged upward, bubbles residing in the damping chamber is moved toward a outer circumferential rim side of the flange portion along the front-side circularly annular end face of the flange portion after moved upwardly, and passes through a position between the annular outer circumferential surface of the flange portion and the inner