Patent ID: 8747508

Claim:
A honeycomb filter comprising: a honeycomb base material including a porous partition wall parent material to partition and form a plurality of cells which become through channels of a fluid; plugged portions arranged in open frontal areas of predetermined cells in an end surface on an inflow side of the fluid and open frontal areas of the remaining cells in an end surface on an outflow side of the fluid; and a porous collecting layer disposed on the surface of the partition wall parent material in at least the remaining cells, wherein the collecting layer has a constitution in which a plurality of particles combine or intertwine with one another, the collecting layer includes flat plate-like particles as the plurality of particles, the plurality of particles are particles in which an average particle long diameter is 0.2 μm or larger and smaller than 10 μm, an average value of ratios (long diameters/short diameters) of the long diameters to the short diameters of the respective particles is smaller than 3, and an average value of ratios (the long diameters/thicknesses) of the long diameters to thicknesses of the respective particles is 3 or larger, and an open area ratio of the surface of the collecting layer is 10% or larger.