Patent ID: 7867456

Claim:
A honeycomb structure comprising: an outer wall; partition walls disposed inside the outer wall; and a plurality of cells partitioned from one another by the partition walls, extending in the axial direction, each cell having a generally rectangular cross-section shape in the direction perpendicular to the axial direction; wherein the honeycomb structure has a reinforced part in a part of the outer wall, and the reinforced part in the cross section perpendicular to the axial direction of the honeycomb structure lies at least in the range from the point located at 40° on the outer wall to the point located at 50° on the outer wall and within the range from the point located at 30° on the outer wall to the point located at 60° on the outer wall, with respect to the longitudinal direction of the partition wall about a sectional center of the honeycomb structure; wherein a mean thickness of the reinforced part in the perpendicular cross-section in the direction of the sectional center is in the range of 1 to 10 mm, wherein the reinforced part is formed by plugging, and wherein the thickness of the partition walls not in the reinforced part are substantially uniform.