To use a closed loop like suction body to a sucked body with a projection and a hole by forming the whole of a soft resin, etc., into a closed loop, setting the bottom faces of the loop inner and outer circumferences flat and smooth, setting a space between the inner and outer circumferences to a recessed shape, setting the thicknesses of the inner and outer circumferences to thinner than that of the recessed portion, and setting the whole into the uniform thickness.

A suction body 1 is formed of vinyl chloride rich in flexibility and superior in insulation by an injection molding machine, the inner circumference 11 and the outer circumference 12 of the closed loop are formed into approximate rectangles with same center and same ratio, a recessed portion 13 is formed with the bottom center of the inner circumference 11 and the outer circumference set to the vertex, the wall thicknesses of the inner circumference 11 and the outer circumference 12 are set to thin and gradually thickened toward the center, and the whole is formed into the uniform thickness same as the thickness of the cross section. The whole vertex of the recessed portion 13 is pressed and the recessed portion 13 is set into a vacuum state so that a sucked body is sucked. This constitution allows the sucked body to be sucked, even if it is approximately flat and has a projection or a hole on the face to be sucked, so as to be used for a shock prevention structure for an electrical conduction connector.