Sealed honeycomb structure

A sealed honeycomb structure comprising:

• porous walls dividedly forming a plurality of cells extending from an end surface of an inlet side to an end surface of an outlet side, the plurality of cells being a plurality of fluid channels;
• an outlet side sealing portion mounted at openings of predetermined cells in the end surface of the outlet side to form inlet cells where the end surface of the inlet side is open and the end surface of the outlet side is sealed;
• and
• an inlet side sealing portion mounted at openings of remaining cells in the end surface of the inlet side so as to form outlet cells where the end surface of the outlet side is open and the end surface of the inlet side is sealed,
• wherein at least one cell among the outlet cells is a reinforced cell where a reinforced part for reinforcing the at least one cell among the outlet cells are formed at at least one corner portion at which the walls on a cross-section vertical to an extending direction of the cells cross each other,
• wherein the inlet cells are provided with a reinforced part for reinforcing the inlet cells at at least one corner portion at which the walls on the cross-section vertical to the extending direction of the cells cross each other, and
• wherein a total number of the at least one corner portion reinforcing the inlet cells is smaller than a total number of the at least one corner portion reinforcing the outlet cells.