HONEYCOMB FILTER AND MANUFACTURING METHOD THEREFOR

To provide a honeycomb filter restricted in an increase in pressure loss.SOLUTION: A honeycomb filter includes: a columnar honeycomb structure 4 having a porous partition wall 1 disposed so as to surround a plurality of cells 2; and a plugging portion 5 disposed in one of openings of each cell 2. The partition wall 1 is composed of a material containing cordierite as a main component. A porosity of the partition wall 1 is 60 to 70%, an average pore diameter of the partition wall 1 is 20 to 30 μm, and an open porosity of a pore with an equivalent circle diameter of more than 1.5 μm, existing in a surface of the partition wall 1, is 31% or more. In a pore size distribution in which a cumulative pore volume of the partition wall 1 is expressed based on a log pore diameter as a horizontal axis and a log differential pore volume (cm3/g) as a vertical axis, a half width of a first peak including a maximum value of the log differential pore volume is 0.20 or less.SELECTED DRAWING: Figure 1 【課題】圧力損失の上昇が抑制されたハニカムフィルタを提供する。【解決手段】複数のセル２を取り囲むように配置された多孔質の隔壁１を有する柱状のハニカム構造部４と、セル２のいずれか一方の開口部に配設された目封止部５と、を備え、隔壁１が、コージェライトを主成分として含む材料から構成され、隔壁１の気孔率が、６０～７０％であり、隔壁１の平均細孔径が、２０～３０μｍであり、隔壁１の表面に存在する円相当径１．５μｍ超の細孔の開気孔率が、３１％以上であり、隔壁１の累積細孔容積を、横軸をｌｏｇ細孔径とし、縦軸をｌｏｇ微分細孔容積（ｃｍ３／ｇ）として示した細孔径分布において、ｌｏｇ微分細孔容積の最大値を含む第一ピークの半値幅が、０．２０以下である。【選択図】図１