Folding stairs, wherein the folding stairs comprise: at least one step comprising an upper side and a lower side , a holding system being adapted to hold the at least one step , wherein the at least one step is movably attached to the holding system , wherein the folding stairs comprise an unfolded state and a folded state, wherein the holding system is adapted to attach the folding stairs to a vertical wall such that in the unfolded state the upper side of the at least one step is horizontally aligned to form a climbing aid and in the folded state the lower side of the at least one step is aligned parallel with the wall, characterized in that the holding system further comprises: a fastening element , wherein the fastening element is adapted to attach the folding stairs to the wall, and a supporting element , wherein the supporting element is adapted to support the at least one step in the unfolded state, wherein the supporting element is attached to the fastening element by means of a slidable hinge , and the slidable hinge is arranged to allow a sliding motion of the supporting element vertically along the fastening element , wherein the fastening element comprises a rail portion , wherein the supporting element is attached to the rail portion of the fastening element by means of the slidable hinge , and the supporting element is adapted to move along the rail portion by means of the slidable hinge during a transition between the folded and the unfolded state. at least one step comprising an upper side and a lower side , a holding system being adapted to hold the at least one step , wherein the at least one step is movably attached to the holding system , wherein the folding stairs comprise an unfolded state and a folded state, wherein the holding system is adapted to attach the folding stairs to a vertical wall such that in the unfolded state the upper side of the at least one step is horizontally aligned to form a climbing aid and in the folded state the lower side of the at least one step is aligned parallel with the wall, characterized in that the holding system further comprises: a fastening element , wherein the fastening element is adapted to attach the folding stairs to the wall, and a supporting element , wherein the supporting element is adapted to support the at least one step in the unfolded state, wherein the supporting element is attached to the fastening element by means of a slidable hinge , and the slidable hinge is arranged to allow a sliding motion of the supporting element vertically along the fastening element , wherein the fastening element comprises a rail portion , wherein the supporting element is attached to the rail portion of the fastening element by means of the slidable hinge , and the supporting element is adapted to move along the rail portion by means of the slidable hinge during a transition between the folded and the unfolded state. a fastening element , wherein the fastening element is adapted to attach the folding stairs to the wall, and a supporting element , wherein the supporting element is adapted to support the at least one step in the unfolded state, wherein the supporting element is attached to the fastening element by means of a slidable hinge , and the slidable hinge is arranged to allow a sliding motion of the supporting element vertically along the fastening element , wherein the fastening element comprises a rail portion , wherein the supporting element is attached to the rail portion of the fastening element by means of the slidable hinge , and the supporting element is adapted to move along the rail portion by means of the slidable hinge during a transition between the folded and the unfolded state. <EOS>