PARTITION WALL OF FOLDED STAIR

To provide a partition wall of a folded stair capable of suppressing a decrease in out-of-plane rigidity of partition wall and increase in displacement due to that even when the thickness of the partition wall is reduced.SOLUTION: A folded stair 10 constituted of a set of lower straight stairs 10A, a folded part 10B, and a set of upper straight stairs 10C, includes: a frame base material 30, 40 that is a partition wall 100 that separates the lower straight stairs 10A and the upper straight stairs 10C including vertical rails 31, 41 and horizontal rails 32, 42. The folded stair 10 includes; frame base materials 30, 40 including the vertical rails 31,41 and the horizontal rails 32, 42; first reinforcing hardware 50 extending in a horizontal direction; multiple face materials arranged around the frame base materials 30, 40, and the first reinforcing hardware 50.SELECTED DRAWING: Figure 2 【課題】間仕切り壁の厚みを薄くした場合においても、間仕切り壁の面外剛性の低下とこれに起因する変位の増大を抑制することのできる、折返し階段の間仕切り壁を提供する。【解決手段】下側直階段部１０Ａと、折り返し部１０Ｂと、上側直階段部１０Ｃとにより構成される、折返し階段１０において、下側直階段部１０Ａと上側直階段部１０Ｃを仕切る間仕切り壁１００であって、縦桟３１，４１と横桟３２，４２とを有する軸組下地材３０，４０と、横方向に延設する第一補強金物５０と、軸組下地材３０，４０と第一補強金物５０との周囲に配設される複数の面材とを有する。【選択図】図２