Patent ID: 7056365

Claim:
A honeycomb structure in which a plurality of through-holes extending in the axial direction are formed by a plurality of partition walls, characterized in that said plurality of partition walls are constituted by a plurality of partition walls having different thicknesses, and of said plurality of partition walls having different thicknesses, those partition walls having a thickness larger than the average thickness of all partition walls are provided at a higher proportion in a particular portion of the honeycomb structure whole portion having partition walls than in other portions, wherein: the thickness of the partition walls increases in a first direction along a first part of a first path extending from an interior portion of the honeycomb structure to a first exterior portion of the honeycomb structure, the thickness of the partition walls also decreases in the first direction along a second part of the first path, the first and second parts of the first path each extending across a plurality of through-holes; the thickness of the partition walls increases in a second direction along a first part of a second path extending from the interior portion of the honeycomb structure to a second exterior portion of the honeycomb structure, the thickness of the partition walls also decreases in the second direction along a second part of the second path, the first and second parts of the second path each extending across a plurality of through-holes; and the first direction is opposite to the second direction.