Abstract: A folding ladder comprises a series of modules, each module including a pair of spaced, parallel stile sections connected together by a transverse tread section. The modules are of decreasing size and each module, except for the largest one, is pivotally mounted between the stile sections of the next adjacent larger module, so that it can be folded from an extended position to a folded position in which the smaller module is nested within the larger module, releasable bolts being provided to lock the modules in the extended position. The tread and stile sections are hollow, and are connected together by separately formed joint members, one end of each joint member being secured within the hollow stile section, and the other end being secured within the hollow tread section.