To provide a supporting structure of a standing-up wall and its construction method capable of improving working efficiency by reduction of manhour of standing-up wall construction work without being required for screw connecting work of the lower end section of the standing-up wall.

The standing-up wall supporting structure comprises a supporting device 1 providing an installation section 1a to a projection 1c and a construction floor surface F provided to a standing-up wall supporting surface 1b and a position on the front side from the standing-up wall supporting surface 1b and a partition plate 2 sticking the projection 1c therein to engage. The installation section 1a of the supporting device 1 is fixedly installed in a proper position of the construction floor surface F, and the partition plate 2 can stand by itself by abutting the rear side 2b of the partition plate 2 on the standing-up wall supporting surface 1b in a state to stick the projection 1a in the bottom 2a of the partition plate 2. Accordingly, when a standing-up section of the standing-up wall is installed, usual connecting work by means of a screw or the like is not needed.