Patent ID: 7658985

Claim:
A honeycomb structure comprising: a honeycomb segment joined body having a plurality of honeycomb segments integrally joined at joint faces by means of a bonding material layer, and an outer peripheral coat layer covering an outer peripheral surface of the honeycomb segment joined body, with a structure having plurality of cells functioning as fluid passages disposed in parallel with one another between two end portions of the honeycomb segment joined body in a central axis direction; wherein a thickness of the bonding material layer satisfies the relation of (T 2 )=(1.2 to 10.0)×(T 1 ) between an average thickness (T 1 ) at both end portions and a maximum thickness (T 2 ) between two positions away from the end portions, the two positions each being 3 to 40% of the whole length of the honeycomb segment apart from a respective one of the end portions.