Patent ID: 8808836

Claim:
A honeycomb structure comprising: a plurality of cells, each of the cells having a hexagonal shape and being surrounded by six partition walls, the partition walls being arranged in a hexagonal lattice pattern on the entirety of a radial cross section of the honeycomb structure; and a cylindrical outer peripheral wall, with which an outer wall surface of the honeycomb structure is covered, wherein the partition walls are composed of a plurality of sides and intersection points, six sides forming one cell of a hexagonal shape, and three partition walls are joined to each other at a corresponding intersection point, the sides of the partition walls are divided into sides of basic partition walls and sides of strength reinforcement partition walls, a thickness of each of the strength reinforcement partition walls being thicker than a thickness of each of the basic partition walls, at least some of the intersection points are strength reinforcement intersection points, and three strength reinforcement sides as the strength reinforcement partition walls are joined to each other at a corresponding strength reinforcement intersection point, each of the three strength reinforcement sides, which form one group of three partition walls, are joined at one strength reinforcement intersection point which is not connected continuously to any of the strength reinforcement sides, which form another group of three partition walls, joined at another strength reinforcement intersection point; and the strength reinforcement intersection points are arranged on the entire surface of the radial cross section of the honeycomb structure, which is perpendicular to the axial direction of the honeycomb structure.