The pivoting arm rest has a pivoting section (2) opposite to a chair, and a rotating section (40) that is twisting opposite to the pivoting section. A carrier element (200) is provided for rotating carrier of the pivoting section at the chair. A blocking element (7) is provided, which is designed such that the pivoting section of the arm rest is swiveled only against the chair when the rotating section of the armrest adopts a pre-defined position opposite to the pivoting section.
