Patent ID: 8747509

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 and which extend from one end surface to the other end surface; plugged portions arranged in open frontal areas of predetermined cells in an end surface on an inflow side of the fluid which is the one end surface, and open frontal areas of the remaining cells in an end surface on an outflow side of the fluid which is the other end surface; and a porous collecting layer disposed on the surface of the partition wall parent material in the remaining cells, wherein in a cross section orthogonal to an extending direction of the cells, a shape of the cells is a rectangular shape, and a thickness of a portion of the collecting layer which is positioned in each of corner portions of each of the cells is from more than one to less than three times that of a portion of the collecting layer which is positioned in the center of each of sides of the cell.