Honeycomb structure

A honeycomb structure comprising:

• a honeycomb structure body including porous partition walls defining and forming a plurality of cells which extend in a cell extending direction from an inflow end face to an outflow end face and become through channels for fluid, and a porous outer wall surrounding the partition walls, the honeycomb structure body has any one of a round, elliptic, triangular, quadrangular, pentagonal, hexagonal or octagonal shape in a cross-section of the honeycomb structure body in a direction perpendicular to the cell extending direction;
• a porous supporting bulge disposed to extend out from a circumference of the outer wall so that at least a part of the outer wall is exposed;
• and
• plugging portions arranged in open ends of predetermined cells in the inflow end face and open ends of residual cells in the outflow end face,
• wherein the supporting bulge has a plurality of support portions protruding from the circumference of the outer wall toward the outside of the outer wall, and at least one side wall portion supported by the support portions, and
• the partition walls and the outer wall of the honeycomb structure body and the support portions and the side wall portion of the supporting bulge are all formed monolithically from the same ceramic raw material and additives.