STAIRCASE AND ASSEMBLY METHOD OF STAIRCASE

To provide a staircase capable of stably receiving treads and risers, and an assembly method of the staircase.SOLUTION: A staircase 1 according to the present embodiment comprises: a side plate 3 that has an inserted part 31 in one surface and in which other surface brings into contact with a wall surface 21 and a part of an end surface brings into contact with a floor surface 22 and mounts to the wall surface 21; a lowermost tread 41 that is inserted into the inserted part 31 and in which a groove 411 extending in the direction crossing the side plate 3 is provided at an undersurface; and a riser 43 that is inserted into the inserted part 31 and the groove 411. In the staircase 1, the inserted part 31 is a recess part or an opening, and a rear part of the inserted part 31 is made to be open and brings into contact with the wall surface 21, the undersurface of the tread 41, a rear surface of the riser 43, and the floor surface 22, and comprises a board receiving component 5 mounted to the wall surface 21.SELECTED DRAWING: Figure 1 【課題】段板及び蹴込板を安定して受け止めることができる階段及び階段の組み立て方法を提供する。【解決手段】本実施の形態に係る階段１は、一面に被挿入部３１を有し、他面が壁面２１に接触し、端面の一部が床面２２に接触しており、前記壁面２１に取り付けられている側板３と、前記被挿入部３１に挿入されており、前記側板３に交差する方向に延びる溝４１１が下面に設けられている最下段の段板４１と、前記被挿入部３１及び前記溝４１１に挿入されている蹴込板４３とを備える階段１において、前記被挿入部３１は凹部又は開口であり、前記被挿入部３１の後部は開放されており、前記壁面２１、前記段板４１の前記下面、前記蹴込板４３の後面、及び前記床面２２に接触しており、前記壁面２１に取り付けられている板受け部材５を備えることを特徴とする。【選択図】図１