PURPOSE: To solve the problem that a laminated body of folded wet sheets required overlapping of upper and lower sheets with a proper overlapping width and moreover reduction in a whole folding width is difficult even when the proper overlapping width is attained. CONSTITUTION: In each sheet folded body 20, medium pieces 23 and 24 are folded by a folding line 22, an upper folded piece 26 is folded back onto the piece 23 and a lower folded piece 28 is folded back under the piece 24. Then, the upper folded piece 26 of a lower sheet is overlapped on the piece 28 of an upper sheet. In this folding structure, when the piling width Lw of the upper/ lower sheets is made to be near 30 mm by using a sheet of the whole width being 200 mm, e.g. a width size can be reduced to about 56 mm.