Scaffolding bar of metal with an elongate rod-shaped girder profile member (21.1, 21.2) of steel, which extends in the direction of a first longitudinal axis in a first longitudinal direction and which as considered in the first longitudinal direction has a girder profile member length and a girder profile member longitudinal centre and as considered in a cross-section extending perpendicularly to the longitudinal direction has a girder profile member width (27.1, 27.2), a girder profile member height (40.1, 40.2) and a girder profile member wall thickness (28.1. 28.2), the member having a support edge (30.1), which is upper as considered in an installed setting, or support edges (30.2.1, 30.2.2), which are upper as considered in the installed setting, for support and/or suspension of a scaffolding covering or a plurality of scaffolding coverings, wherein the girder profile member (21.1, 21.2) has two girder profile member ends (32.1, 32.2), which extend away from one another in opposite directions in the first longitudinal direction and to each of which is welded either a respective connecting head (33.1) of metal for detachable fastening of the scaffolding bar (20.1) in the installed setting to a fastening element, which is provided with at least one passage, of a scaffolding element by means of a connecting wedge insertable through the passage or a respective hook-shaped suspension claw or suspension catch (33.2) of metal, which is downwardly open as respectively considered in the installed setting, for detachable support and/or suspension of the scaffolding bar (20.2, 20.6) in the installed setting on and/or at scaffolding components, and wherein attached to a side, which forms an underside in the installed setting, of the girder profile member (21.1, 21.2) is an elongate rod-shaped U reinforcing profile member (22.1, 22.2) of sheet steel, which extends away from the girder profile member (21.1, 21.2) to underneath the girder profile member (21.1, 21.2) in the installed setting and extends in the direction of a second longitudinal axis in a second longitudinal direction parallel to the girder profile member (21.1, 21.2) or parallel to the first longitudinal axis thereof - with bridging-over of the girder profile member longitudinal centre - along the girder profile member (21.1, 21.2) continuously over a reinforcing profile member length corresponding with at least half the girder profile member length of the girder profile member (21.1, 21.2), and wherein the U reinforcing profile member (22.1, 22.2) as considered in a cross-section extending perpendicularly to the second longitudinal axis has substantially over its entire reinforcing profile member length a first U-shaped U profile cross-section (51.1, 51.2) and is formed with a first base profile, which extends in the second longitudinal direction and from which two lateral first U profile limbs (48.1.1, 48.1.2; 48.2.1, 48.2.2) are folded or bent away, the limbs extending substantially perpendicularly away from the first base profile in the same direction substantially parallel to one another at a transverse spacing which corresponds with a first base profile width and upwardly as considered in the installed setting and having fastening ends (49.1.1, 49.1.2; 49.2.1, 49.2.2) welded to the underside of the girder profile member (21.1, 21.2), and wherein the U reinforcing profile member (22.1, 22.2) has a U reinforcing profile member width which corresponds with the transverse spacing and a U reinforcing profile member height (50.1, 50.2) which corresponds with a spacing of the fastening ends (49.1.1, 49.1.2; 49.2.1, 49.2.2) from the first base profile and is greater than the U reinforcing profile member width, characterised in that the U reinforcing profile member height (50.1, 50.2) is greater than the girder profile member height (40.1, 40.2) measured in the same direction as the U reinforcing profile member height (50.1, 50.2) and that the U reinforcing profile member width is smaller, by more than twice the wall thickness (28.1, 28.2) of the girder profile member (21.1, 21.2), than the girder profile member width (27.1, 27.2) measured in the same direction as the U reinforcing profile member width.