An elastic main body member, a partition member, a diaphragm and a fixing ring are piled up in an outer cylinder of long cylindrical shape that surrounds the whole outside of the elastic main body member, and combined together by fixing the fixing ring by claws of the outer cylinder. An elastic main body member drain recess, a partition member first drain recess and a fixing ring drain recess are formed in each of outer circumferential portions of the elastic main body member, the partition member and the fixing ring and, when assembling, aligned continuously with each other, so that a water drain passage is formed inside the outer cylinder.

A shock absorber including a cylindrical outer shell and a piston rod slidably inserted into the outer shell, the shock absorber includes a cylindrical dust cover that is coupled to the piston rod and that permits an entry of the outer shell to inside thereof, and a cylindrical bellows whose one end is attached to the outer shell and whose another end is arranged inside the dust cover at all times to cover an outer periphery of the piston rod.

A sealing device includes a movable part which is fixed to a shaft penetrating a wall of a vessel and is movable with the shaft, the vessel being configured to include an interior space, a first bellows part which has a first end fixed to the vessel and a second end fixed to the movable part, for sealing a penetrated portion of the vessel by the shaft, a second bellows part which is disposed opposite to the first bellows part across the movable part, and has a first end disposed on a side of the first bellows part and fixed to the movable part, and a second end fixed to a stationary member, and a communication path for causing an interior space of the first bellows part and an interior space of the second bellows part to communicate with each other.