Honeycomb structure

A honeycomb structure comprising:

• a tubular honeycomb structure body having porous partition walls to define a plurality of cells extending from a first end face to a second end face,
• wherein in a cross section perpendicular to an extending direction of the cells of the honeycomb structure body, the partition walls are disposed so that a shape of the cells is polygonal, and
• the honeycomb structure body is constituted so that a thickness of the partition walls in a circumferential region positioned on an outer side of a central region is larger than a thickness of the partition walls in the central region including a center of gravity of the cross section, and
• in the cross section of the honeycomb structure body, when one line segment passing the center of gravity of the cross section and extending in a direction perpendicular to the partition walls each constituting one side of each of the polygonal cells is to be a first line segment, for respective five or less cells each arranged on the first line segment toward each of the central region side and the circumferential region side from a boundary between the central region and the circumferential region among the cells arranged on the first line segment, a cell pitch in an extending direction of the first line segment has a size of 70% or more and 95% or less to a cell pitch in the extending direction of the first line segment of the cells arranged on the first line segment in the central region excluding the respective five or less cells.