Patent ID: 8236404

Claim:
A honeycomb structure comprising a plurality of columnar honeycomb segments in which two kinds of plural through-holes different in end face area are formed side by side by being surrounded by partition walls, each honeycomb segment having, at one end face, an inlet side of high opening ratio wherein through-holes of smaller end face area are plugged and, at other end face, an outlet side of low opening ratio wherein through-holes of larger end face area are plugged, the plurality of honeycomb segments being bonded to each other via a bonding material in the longitudinal direction of each honeycomb segment, in which honeycomb structure the Young's modulus of the bonding material when sintered is smaller than the Young's modulus of each honeycomb segment when sintered, and the bonded width of the bonding material is larger at the outlet side of honeycomb structure than at the inlet side of honeycomb structure, wherein the difference between the bonded width of the bonding material at the outlet side of the honeycomb structure and the bonded width of the bonding material at the inlet side of the honeycomb structure ranges from 0.06 mm to 0.53 mm.