To insert a lower side upper bush into a hole part of a plate-shaped part so as to surely provide fitting between the hole part and an annular protrusion of the lower side upper bush, when an upper end part in a rod of a sock absorber is assembled to the car body side by each upper bush interposing vertically the plate-shaped part on the car body side.

Respective upper bushes 2, 3 are arranged on the upper and lower sides of a car body side plate-shaped part 1, a cylindrical collar 4 is inserted in the plate-shaped part 1 and both the upper bushes 2, 3, and an upper end part in a piston rod 6 of a shock absorber is inserted into the collar 4, so as to assemble the upper end part of the piston rod 6 to the plate-shaped part 1 through both the upper bushes 2, 3, but an annular protrusion 10 of the lower side upper bush 3 is inserted in a hole part 5 of the plate-shaped part 1 and protruded to its upward, an upper end internal peripheral edge thereof is protruded to the inside, when the collar 4 is inserted from downward into a central hole part 12 of the protrusion 10, an upper end external peripheral edge is protruded to the outside.