To improve the detergency and durability of a filter cloth for conveying a green sheet and at the same time, ameliorate the yield of aqueous cement slurry during press forming, and further, prevent the clogging of a water drain hole or a water removing hole or the like in the lower face part of a press from occurring.

When press forming a green sheet 1 obtained by making the sheet-like form of aqueous cement slurry, the green sheet 1 is conveyed after placing the green sheet 1 on a plastic filter cloth 2 with a jesh size of 20-125 and a sheet 3 with cushioning properties and water permeability is arranged under the plastic filter cloth 2 to be formed by press. In addition, a cutting blade is mounted on the upper face part of the press for press-forming to cut the green sheet 1 simultaneously with the forming process.