Honeycomb structure

A honeycomb structure comprising:

• a ceramic block comprising:
• a plurality of honeycomb fired bodies each having cell walls extending along a longitudinal direction of said plurality of honeycomb fired bodies to define cells, said plurality of honeycomb fired bodies comprising:
• first-shaped units each having a substantially quadrangular shape in a cross section perpendicular to the longitudinal direction;
• second-shaped units each having a shape that includes at least a first side, a second side longer than said first side and making a substantially right angle with said first side, and an inclined side facing said substantially right angle in the cross section perpendicular to the longitudinal direction, each of said second-shaped units being disposed in a peripheral portion of said ceramic block in such a manner that said inclined side is in contact with a sealing material layer;
• third-shaped units each having a substantially right triangular shape with a hypotenuse and adjacent sides in the cross section perpendicular to the longitudinal direction, each of said third-shaped units being disposed on an inner side of said second-shaped units in said ceramic block in such a manner that the hypotenuse faces said second side of one of said second-shaped units with an adhesive layer between the hypotenuse and said second side;
• and
• said first-shaped units including peripheral first-shaped units, each of said peripheral first-shaped units being disposed in such a manner as to have two sides, one side of said two sides facing one of the adjacent sides of one third-shaped unit among the third-shaped units with said adhesive layer between the one side of said two sides and the one of the adjacent sides, another side of said two sides facing one of the adjacent sides of another third-shaped unit among the third-shaped units with the adhesive layer between the another side of said two sides and the one of the adjacent sides, said two sides of each of said peripheral first-shaped units or extensions of said two sides being each neither substantially parallel nor substantially perpendicular to an extension of said second side and an extension of said first side of each of said second-shaped units;
• and
• the adhesive layer being interposed between said plurality of honeycomb fired bodies to combine said plurality of honeycomb fired bodies;
• and
• the sealing material layer being provided on a peripheral face of said ceramic block.