Patent ID: 7766991

Claim:
A honeycomb structural body comprising: a columnar structural body having an inlet side and an outlet side, the columnar structural body comprising aluminum titanate 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 columnar structural body, the large-capacity and small-capacity through holes being alternately formed in the columnar structural body; and a sealing material comprising aluminum titanate and having a porosity substantially equal to a porosity of the columnar structural body, the sealing material being disposed to seal the large-capacity through holes of the columnar structural body at the outlet side of the columnar structural body and the small-capacity through holes of the columnar structural body at the inlet side of the columnar structural body, wherein the plurality of large-capacity through holes has a total cross-section area which is larger than a total cross-section area of the small-capacity through holes, the columnar structural body has a polygonal shape and chamfered corner portions in a cross section perpendicular to the length direction, and at least one of the plurality of large-capacity through holes and the plurality of small-capacity through holes includes ones adjacent to the chamfered corner portions of the columnar structural body.