To simply and surely form a form and prevent a fall accident or the like by molding the kick face of a staircase, and constituting the form of a kick mold plate providing the fixing part of the form molding the upper and lower tread face, a kick molding part attached width-adjustably on both the sides, and an extended side plate.

A form for staircase construction 1 is formed of a galvanized iron plate, and provided with a side plate 4 extended from kick molding parts 3, 3 on both the sides of a kick molding plate 2 to the vertical direction. The kick molding part 3 is overlapped on the front side of the kick molding plate 2, the connection fixing part is made a slot 5, and can cope with the width of a constructing staircase. A plurality of holes are drilled on the upper folding part of a cross sectional U-shaped kick molding plate 2 to be made the fixing part 9 of a tread molding form, L-shaped attaching tools 10, 10 are provided on a lower part as the fixing part 9, and a tread face molding form is supported to be fitted between it and the lower folding part of the kick molding plate 2. The slot 5 is drilled in the attaching tool 10 to cope with the thickness of the tread face molding form.