Abstract: A topple-proof buffering structure for the chair comprises an elastic supporting plate having two deforming buffering portions protruded from an outer side of a fixing substrate, a seat fixing plate assembled to a bottom side of a seat of the chair, and at least two flexible pillars respectively having a bolt member, a screw hole member, and a limit screw. The bolt member has an embedding end and an outer threading section. An inner screw hole is arranged at a surface of the embedding end. One end of the screw hole member opposite to the screw hole has a small diameter hole and a retaining lip. The limit screw is passed through the small diameter hole of the screw hole member and screwed in the inner screw hole of the bolt member so as to support the flexible pillars not to be damaged and broken.