| 摘要 |
In a honeycomb filter 20, partition portions and trapping layers are formed such that a pore volume difference that is obtained from pore distributions measured by mercury porosimetry and is a difference in volume of pores having a diameter of 10μm or less between the downstream portion and the upstream portion of the honeycomb filter, is in the range of 0.01 cm3/g or more and 0.08 cm3/g or less. In the honeycomb filter, in the downstream portion, a first pore volume peak is present in a first pore diameter range of 2μm or more and 9μm or less and a second pore volume peak that is higher than the first pore volume peak is present in a second pore diameter range of 10μm or more and 25μm or less.
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