Abstract: A folding ladder comprising two pairs of uprights hinged at their top and a plurality of rungs connected to said uprights, in which each rung is formed from two equal portions hinged together and is connected to the other rungs at said point of mutual hinging by a rod parallel to the uprights. Moreover the rungs are hinged at their ends to said uprights for passing from the working configuration of the ladder in which they are orthogonal to the uprights, to the folded configuration of the ladder in which they are substantially parallel to the uprights.