(57) A curved staircase (1) and a stair tread (4,5,6,7) for a curved staircase (1) capable
of reducing a stock space used for stock keeping, enhancing the working efficiency
for shipment without requiring a selection operation in accordance with a curve direction
of a curved staircase (1), and facilitating assembly at a building site is provided.
A curved staircase A (1) is formed by asymmetrical stair treads (4,5,6 and 7) such
that finishing process for enabling use as a treadboard is applied to one horizontal
surface of each stair tread (4,5,6,7), which can be an upper surface when arranged
in a curved portion (10) bent in the right-hand direction and the same finishing process
as that for the former horizontal surface is applied to the other horizontal surface
of the stair tread (4,5,6,7), which can be an upper surface when the stair tread (4,5,6,7)
is inverted to be arranged in the curved portion (10) bent in the left-hand direction.
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