Abstract: Hydraulic anti-vibration support comprising first and second rigid frames interconnected by an elastomeric body which partially delimits an operating chamber filled with liquid, the second frame being fixed to a flexible elastomeric wall which partially delimits a compensation chamber communicating with the operating chamber via a restricted passage, the operating chamber and compensation chamber being separated from each other by a rigid partition fixed to the second frame. The second frame comprises first and second parts made from plastics material which are assembled to each other by rotary friction welding, and which are fixed, respectively, to the elastomeric body and to the flexible elastomeric wall.