Patent ID: 8283019

Claim:
A honeycomb structured body comprising: a plurality of cells that are placed in parallel with one another in a longitudinal direction with a cell wall therebetween; and a sealing portion sealing either one of the end portions of the cells, wherein the honeycomb structured body has a porosity of at least about 70% and at most about 95% and having a length about 0.2 to about 0.9 times a diameter thereof, the length being in the longitudinal direction of the honeycomb structured body, and the diameter being of a cross-section perpendicular to the longitudinal direction of the honeycomb structured body, wherein the honeycomb structured body is mainly composed of inorganic fibers and is also composed of an inorganic matter containing silica, the inorganic fibers are fixed with one another by the inorganic matter containing silica, and a vicinity of each intersecting portion between the inorganic fibers is fixed to each other, wherein the honeycomb structured body has an aperture ratio that is at least about 30% and at most about 50%.