To provide a construction method for a temporary structure and an underground structure for pumping water in an underground space surrounded by a soil retaining wall easily and inexpensively and preventing the work for constructing a skeleton from being adversely affected.

This construction method for the underground structure includes a process for constructing the soil retaining wall 10 to cover the outer periphery of an excavation region and reach beyond depth of flooring face in the excavation region, a process for forming a pumping well 20 for pumping and discharging underground water in the excavation region or beyond the depth of flooring face, a process for excavating the excavation region while discharging the underground water through the pumping well 20 to form the underground space, and a process for constructing the skeleton in the underground space to form the pumping well 20 between the skeleton and the soil retaining wall 10.