To provide a stably supporting structure at a sharp slope by tilting a retaining wall at the upper part of a foundation pile along a normal plane for the upper part to be open and arranging a supporting column in contact with the lower face of the retaining wall at a preset angle.

A sharp mountain is cut at a normal plane S and a retaining wall receiving beam 31 and a supporting column receiving beam 31 are fixed to annexed foundation piles 3, 3' via reinforcing bars 32, 32'. The lower face of a retaining wall 1 is pivotally supported by a supporting column 2 to be sectionally T-shaped, the end on the normal plane side of the retaining wall 1 is pivotally supported by the retaining wall receiving beam 31 and the lower end of the supporting column 2 is pivotally supported by the supporting column receiving beam 31. The retaining wall supporting column is arranged in contact with the retaining wall at angles of 60-120°. Cut soil 4 is put in a sectionally V-shaped pocket formed in the upper face of the retaining wall 1, road constructing material is accumulated thereon and road paving material 5 and footpath paving material 6 and placed on the top. A road can be similarly paved in the way of general soiling work and the running performance of vehicles is greater improved than that in bridge formation.