Patent ID: 7156934

Claim:
A method of manufacturing a ceramic honeycomb structure, comprising the steps of: attaching sheets onto opposite end faces of a ceramic honeycomb body having a plurality of cells and formed into a honeycomb shape; drilling holes in the sheets at positions corresponding to opening parts of the cells; filling, through the holes, a slurry for sealing into the opening parts of the cells in the opposite end faces of the ceramic honeycomb body; firing the body; and alternately sealing the opening parts of the cells, characterized by comprising the steps of: forming the ceramic honeycomb body into a shape having at least one reference cell which is different in a shape of the opening part in the end face from the other cells; using only the at least one reference cell as a reference point to determine the positions corresponding to the opening parts of the at least one reference cell and the other cells; and drilling the holes in the sheets alternatively at the determined positions corresponding to the opening part of the at least one reference cell and the other cells to be plugged at the filling step.