| 摘要 |
A honeycomb filter includes a pillar-shaped honeycomb fired body having cells longitudinally disposed with a cell wall and having first and second end faces on gas inlet and outlet sides, respectively. A catalyst supporting layer is formed in a catalyst-supporting-layer area covering at least about 25% and at most about 90% of an overall length of the fired body and that abuts the first end face. Substantially no catalyst supporting layer is formed in a non-catalyst-supporting-layer area covering about 10% of the overall length that abuts the second end face. A thermal conductivity of the non-catalyst-supporting area is larger than that of the catalyst-supporting-layer area, where gas permeability coefficient k1 (μm2) of a cell wall in the non-catalyst-supporting-layer area and gas permeability coefficient k2 (μm2) of a cell wall in the catalyst-supporting-layer area satisfy inequalities, (k1−k2)≦̸about 0.5 and about 1.0≦̸k1≦̸about 1.5.
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