To prevent getting out of the shape of a paper-made form from being generated by shielding sinking of water in concrete thereinto by a simple method and to reuse it in a plurality of times.

Three-dimensional data for a curved surface to be embodied in a precast concrete plate are successively sliced by a minute height and cardboards 3 are made to correspond to each of these slices and each cardboard 3 is cut along the contour of the corresponding slice within the paper face and each cardboard 3 after cutting is laminated and bonded in such a way that the curved surface 2 to be embodied is reproduced by an envelope face 6 of the peripheral edge 5 of the opening of each cardboard to form a paper- made form 8 for a female mold 7. The concrete filling face 8a of the paper- made form 8 is coated with an anti-water absorption agent 10 and concrete is filled in this paper-made form 8 coated with the anti-water absorption agent 10.