To provide a connection device for elastically connecting a piston rod in a shock absorber in a suspension mechanism in a vehicle to the body of the vehicle that can be easily assembled, and costs low.

This elastic connection device for the piston rod 14 is composed of a lower cushion rubber 20, a bound stopper 30, a dust cover 32, and a mounting metal fitting 16. The mounting metal fitting 16 is composed of a single plate by bending and molding, and it is provided with a first engagement holding part 66 that is shaped like a cup, and a second engagement holding part 70 that is shaped like an overturned cup. A circumferential wall part 58 is bent in an outward L-letter form. The lower cushion rubber 20 and the bound stopper 30 are assembled to be fitted into the first engagement holding part 66 and the second engagement holding part 70. An upper end part of the dust cover 32 is pressed to get engaged with an outer circumferential surface of the circumferential wall part 58 of the mounting metal fitting 16.