Honeycomb structure

A honeycomb structure, comprising:

• a honeycomb structure body having an inflow end face as one end face and an outflow end face as the other end face and having a porous partition wall that defines a plurality of cells, the plurality of cells extending from the inflow end face to the outflow end face and serving as a through channel of fluid;
• and
• a convex part that protrudes outward from a part of circumference of the honeycomb structure body, wherein
• the convex part is disposed to surround the circumference of the honeycomb structure body like a ring continuously or intermittently,
• the convex part is of a tapered shape at least at one end that having a tapered face,
• the convex part has a circumference coating layer at least making up the tapered face,
• the convex part has a maximum thickness of 1 to 20 mm in a cross section orthogonal to the extending direction of the cells,
• the convex part has a rough-face region on the tapered face including the circumference coating layer, the rough-face region having surface roughness of 5 to 70 μm,
• the honeycomb structure has a total of a rough-face region angle θ of 108° or more, the rough-face region angle θ being a largest angle formed between two straight lines drawn from a center axis of the honeycomb structure toward an outer periphery so as to pass through the rough-face region, when the honeycomb structure is viewed parallel to the center axis of the honeycomb structure, and
• an inclination angle formed between the tapered face and the extending direction of the cells in a cross section parallel to the extending direction of the cells is 10 to 80 degrees.