Ceramic honeycomb structural body and methods of preparing the same

A method of preparing the ceramic honeycomb structural body, comprising:

• lattice walls formed by a large number of cells which are passes for fluid;
• and the peripheral wall which covers the circumference of said lattice walls, the outer peripheral portion of said lattice walls at least located in the vicinity of said peripheral wall containing the portion of smaller porosity denser than that of the inner peripheral portion of said lattice walls which are located inside said outer peripheral portion, characterized in that a melting-point lowering component, which lowers a melting point of a material constituting said ceramic honeycomb structural body, is applied on at least the outer peripheral portion of said lattice walls of said body, and then the resulting body is heat-treated to form said denser portion.