Abstract: In a baking jig 1 for holding a ceramic honeycomb molding 3 having a large number of cells 31 juxtaposed with one another in an axial direction, an upper surface 21 coming into contact with the ceramic honeycomb molding 3 has a concavo-convex shape and one of the end faces 32 of the ceramic honeycomb molding 3 is supported by a large number of parallel convex portions 21. Recess portions 22 formed between the large number of convex portions 21 constitute ventilation passages 4 communicating with outside, and at least 30% of cells among cells 31 of the ceramic honeycomb molding 3 opening to the one end face 32 communicate with the ventilation passages 4 so that a decomposition gas occurring inside can be diffused from a bottom portion.

Abstract: A manufacturing method of a ceramic honeycomb structure body has extrusion molding with ceramic raw materials in a honeycomb structure, cutting to cut a molded one into plural mold bodies, each mold body having an outer peripheral skin part and plural cell walls. The manufacturing method performs a drying process of drying each mold body, a chamfering process of chamfer an edge of a corner of the mold body, and a burning process of burning the mold body in order to form the ceramic honeycomb structure body. The chamfered part has crystal particles of a cordierite 2MgO.2Al2.O3.5SiO2.