A mold having concave portions in a predetermined 3-D shape is prepared. A slurry is filled into the concave portions and the mold storing the slurry is then placed on an upper surface of a ceramic green sheet. A pressure inside the sheet is lowered through a pipe and a sintered porous metal support with the green sheet being heated by a hot plate. Accordingly, a solvent in the slurry is permeated into the fine pores of the green sheet and evaporated, thereby drying the 3-D forming portion without deformation.