PURPOSE: To eliminate vacuum pack processing and coating peeling processing and reduce a cost by interposing a flexible sheet between a force and one face side of a ceramic laminate and supplying a pressure fluid into the fluid chamber of the force to perform pressing.

CONSTITUTION: A ceramic laminate 10 is provided with a stepped recess 15 on the surface side thereof, and square corner parts 15a, 15b are provided at boundary parts where the bottom face of the recess 15 comes into contact with side faces thereof and at boundary pats where the step faces of the recess 15 come into contact with the side faces thereof, respectively. A top force 23 is provided on its lower surface side with a recess 23a opposed to the surface of the ceramic laminate 10, the recess 23a is provided with a communicating passage 23b connected to a hydraulic pump 24, a flexible sheet 23c which closes the opening of the recess 23a is formed in advance on the top force 23, and the recess 23a is formed in a fluid chamber R. Hydraulic pressure is imparted to the fluid chamber R under the condition where the top force 23 is set on the surface of the ceramic laminate 10, the flexible sheet 23c is deformed into the shape of the recess 15 by the application of hydraulic pressure, so that the flexible sheet adheres closely to the surface of the recess 15 of the ceramic laminate 10, and the hydraulic pressure is reliably and uniformly imparted to the entire surface of the ceramic laminate 10.