Abstract: A hollow-body supporting arm of a swing-out hinge for a door of a motor vehicle, in which the door- and pillar-side coupling pins (5) are arranged at the free ends of the supporting arm (1). The supporting arm has two pairs of single reverse-action joints (4). In the supporting arm, the regions of the hinge pins between the single reverse-action joints, which are arranged one above the other, are left open. The supporting arm (1) is divided in such a manner that in addition to a base supporting arm (2) at least one end region having the single reverse-action joints (4) arranged on it is formed as a separate supporting-arm part (3). The mutually facing end sides of the base supporting arm (2) and of the supporting-arm parts (3) are formed in such a manner that they can be connected securely and captively to one another and when connected form a highly rigid supporting arm.