A method for producing a setter for defatting and/or firing, which can produce the setter without using any mold, and which can minimize generation of gas in the firing step of a process for producing the setter. The method enables setting of porosity of the setter to be relatively easily changed, and ensures a predetermined mechanical strength even with the porosity increased over 50%. The setter for defatting and/or firing has pores with an average diameter of 5-1000 .mu.m and porosity in the range of 70-25%. The setter is formed of a porous body having a three-dimensional network structure having a flat surface. A porous sheet is preferably laminated on the surface of the porous body having a three-dimensional network structure, the porous sheet having pores, smaller than the pores of the structure body, with an average diameter of not more than 50 .mu.m and having porosity in the range of 70-25%. The porous body having a three-dimensional network structure or both the structure body and the porous sheet are each preferably made of a material having the same base as a substance to be defatted or formed which is placed on the structure body or the porous sheet.
