A chair comprising a basic structure, a seat, a backrest, and at least one joint made of plastic material, which connects the backrest to the basic structure, wherein the joint has a first connection portion fixed to or integral with respect to the backrest, and a second connection portion connected to the basic structure, wherein said second connection portion comprises a first and a second arm, which are elongated in a longitudinal direction and are set at a distance from one another in a vertical direction, wherein the first arm has a front portion fixed to the basic structure and is deformable between a resting position corresponding to the resting position of the backrest and a deformed position corresponding to the position where the backrest is tilted backwards, wherein the second arm has a front portion, which is mobile in a longitudinal direction with respect to the basic structure between a first position corresponding to the resting position of the first arm, and a second position corresponding to the deformed position of the first arm, and wherein the second arm and the basic structure are provided with respective arrest elements which limit the extent of the travel in a longitudinal direction of the front portion of the second arm and define an end-of-travel of tilting backwards of the backrest.