STAIRWAY STRUCTURE, FIXTURE AND ASSEMBLY METHOD OF STAIRWAY STRUCTURE

PROBLEM TO BE SOLVED: To provide a stairway structure which improves productivity and workability and further is capable of improving appearance and immunity to a load, respectively, a fixture and an assembly method of the stairway structure.SOLUTION: In a proximal end portion of a horizontal surface part 22 of an angle-shaped fixture, a projection 23 is integrally provided which protrudes outside longer than thickness of the angle. A worker screws an inner deep face 51a of an insertion hole 51 which is formed on a screw surface 11a of a side plate 11, to a wall. Next, the projection 23 is inserted into the insertion hole 51 and in such a state, a vertical surface part 21 of the fixture is screwed to the screw surface 11a. In the state where an inner face 22a of the horizontal surface part 22 opposes a bottom face of a tread 10, the horizontal surface part 22 is then screwed to the tread 10. Finally, the vertical surface part 21 and an end portion of the tread 10 are covered with a covering member 31.