Patent ID: 8172921

Claim:
A honeycomb structure comprising: a plurality of pillar-shaped honeycomb fired bodies, each having a number of cells longitudinally disposed in parallel with one another with a cell wall therebetween; an adhesive layer interposed between adjacent honeycomb fired bodies of said plurality of honeycomb fired bodies to combine said plurality of honeycomb fired bodies together; and a sealing material layer formed on an outer peripheral face of said combined plurality of honeycomb fired bodies, said sealing material layer being formed by using a sealing material paste, wherein at least two honeycomb fired bodies of said plurality of honeycomb fired bodies have a curved outer wall that forms a portion of said outer peripheral face of said combined plurality of honeycomb fired bodies, wherein at least one of said outer walls has a protruding portion extending outwardly from a surface thereof in a direction away from a center of said honeycomb structure, wherein said protruding portion is made from a same material as a material of said at least one outer wall, wherein a shape of said protruding portion is an approximately rectangular parallelepiped shape that extends parallel to a longitudinal direction of a respective honeycomb fired body thereof, and wherein both of a width and a height of a cross-sectional shape of said protruding portion, taken along a plane perpendicular to the longitudinal direction, are about 0.5 to about 2 mm.