Patent ID: 7972566

Claim:
A honeycomb filter comprising: a pillar-shaped honeycomb fired body having a large number of cells longitudinally disposed in parallel with one another with a cell wall therebetween, with either one end of each of said cells being sealed, wherein said honeycomb fired body has a first end face on a gas inlet side and a second end face on a gas outlet side such that said honeycomb filter is configured to allow gases to flow in through said gas inlet side and to flow out from said gas outlet side, wherein a catalyst supporting layer is formed in a catalyst-supporting-layer area that covers at least about 25% and at most about 90% of an overall length of said honeycomb fired body and that abuts said first end face on said gas inlet side, wherein substantially no catalyst supporting layer is formed in a non-catalyst-supporting-layer area that covers about 10% of the overall length of said honeycomb fired body and that abuts said second end face on said gas outlet side, wherein a thermal conductivity of said non-catalyst-supporting-layer area is higher than a thermal conductivity of said catalyst-supporting-layer area, and wherein modes “a” (μm) and “b” (μm) satisfy the following inequalities (1) and (2): ( a−b )≦about 5 (1), and about 10≦a≦about 20 (2), the mode “a” being a mode of pore diameters obtained by measuring pore distribution of said non-catalyst-supporting-layer area, the mode “b” being a mode of pore diameters obtained by measuring pore distribution of said catalyst-supporting-layer area.