Honeycomb structure

Abstract

A columnar honeycomb structure comprising an outer peripheral side wall having an outer peripheral side surface; a plurality of partition walls that partition and form a plurality of cells penetrating from one bottom surface to another bottom surface to form flow paths, the plurality of partition walls being disposed inside the outer peripheral side wall; and a pair of terminal connection portions arranged on the outer peripheral side wall, wherein the honeycomb structure satisfies a relationship of H>Hin which: Hrepresents an average height of the entire honeycomb structure; and Hrepresents an average height of a portion of the honeycomb structure surrounded by a straight line Mparallel to a line segment M and located at a distance of 0.1×Lfrom the line segment M toward a first direction and a straight line Mparallel to the line segment M and located at a distance of 0.1×Lfrom the line segment M toward a second direction, wherein when viewing the honeycomb structure from its bottom, the line segment M represents a line segment connecting circumferential centers of the pair of terminal connection portions and extending from one outer peripheral side surface to the other outer peripheral side surface, and Land Lrepresent length in the first direction and the second direction perpendicular to the line segment M from a middle point O of the line segment M to the outer peripheral side surface, respectively.