Patent ID: 8012234

Claim:
An exhaust gas filter comprising: a honeycomb structural body comprising a ceramic material and having a plurality of large-capacity through holes and a plurality of small-capacity through holes extending in parallel in a length direction of the honeycomb structural body, the honeycomb structural body having a wall portion separating the large-capacity through holes and the small-capacity through holes, the large-capacity through holes being open on an inlet side of the honeycomb structural body and sealed by a sealing material on an outlet side of the honeycomb structural body and the small-capacity through holes being open on the outlet side and sealed by the sealing material on the inlet side such that an exhaust gas flows into the large-capacity through holes, passes through the wall portion and is discharged from the small-capacity through holes, wherein the plurality of large-capacity through holes and the plurality of small-capacity through holes have polygonal shapes in a cross section perpendicular to the length direction, and the plurality of large-capacity through holes and the plurality of small-capacity through holes have R-chamfered corner portions or C-chamfered corner portions in the cross section perpendicular to the length direction.