Buffer for loading bays comprising: - a bearing frame with a fixing plate suitable for being fixed to a front vertical wall of the loading bay; - fixing means suitable for fixing the bearing frame to said front vertical wall of the loading bay; - a backing element comprising a head portion, a base portion and a stop surface with concavity that faces the bearing frame and is suitable for receiving the impact of a vehicle; - pivoting means that connect the backing element to the bearing frame in such a way that said backing element rotates around an axis of horizontal rotation; and - an elastic member disposed between the bearing frame and the backing element, characterized in that when sectioned with a vertical plane that is orthogonal to said axis of horizontal rotation, said stop surface has a continuous curvilinear profile without corners and without flat surfaces, in such a way that a surface of the vehicle can slide on the stop surface with a minimum contact that is reduced to a contact line; said elastic member comprises a helical spring with a first end connected to the bearing frame and a second end connected to the backing element; said pivoting means are disposed in correspondence of the base portion of the backing element and said head portion of the backing element is spaced by a maximum distance from a plane parallel to said fixing plate, in such a way that, during an impact, said backing element rotates around said horizontal axis, compressing said helical spring and preventing said head portion of the backing element from coming in contact with said bearing frame and/or said front vertical wall of the loading bay, thus avoiding a deformation of the backing element. - a bearing frame with a fixing plate suitable for being fixed to a front vertical wall of the loading bay; - fixing means suitable for fixing the bearing frame to said front vertical wall of the loading bay; - a backing element comprising a head portion, a base portion and a stop surface with concavity that faces the bearing frame and is suitable for receiving the impact of a vehicle; - pivoting means that connect the backing element to the bearing frame in such a way that said backing element rotates around an axis of horizontal rotation; and - an elastic member disposed between the bearing frame and the backing element, when sectioned with a vertical plane that is orthogonal to said axis of horizontal rotation, said stop surface has a continuous curvilinear profile without corners and without flat surfaces, in such a way that a surface of the vehicle can slide on the stop surface with a minimum contact that is reduced to a contact line; said elastic member comprises a helical spring with a first end connected to the bearing frame and a second end connected to the backing element; said pivoting means are disposed in correspondence of the base portion of the backing element and said head portion of the backing element is spaced by a maximum distance from a plane parallel to said fixing plate, in such a way that, during an impact, said backing element rotates around said horizontal axis, compressing said helical spring and preventing said head portion of the backing element from coming in contact with said bearing frame and/or said front vertical wall of the loading bay, thus avoiding a deformation of the backing element.