PROBLEM TO BE SOLVED: To provide a stair for installing onto a slope face being simply mounted at a low cost while being able to corresponding to a case when the inclination of the slope face is not kept constant and being capable of being easily bypassed even when there is an obstruction in the progressive direction. SOLUTION: The stair for installing onto a slope face is formed in such a manner that the upper plate section 1b of a step 1 placed at a lower section and the lower plate section 1c of a step 1 placed at an upper section are connected by two support members and the constitution is repeated at plural times. Since a plurality of circular through-holes 5 are bored continuously towards the upper section from a section in the vicinity of a lower edge in the support sections 3 in the connection of the step 1 and the support members 3, one is selected from a plurality of the through-holes 5 and a bolt is inserted into the through-hole 5 and one of a plurality of through-holes 2 of the upper plate 1b of the step 1 and the through-hole 5 and one of the through-holes 2 are coupled by a nut in response to the inclination of the slope face.
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