Patent ID: 7858168

Claim:
A honeycomb structure comprising: a plurality of cells partitioned from one another by porous partition walls and extending through the honeycomb structure in an axial direction to constitute flow paths of a fluid, wherein one end of each of predetermined ones of the cells is plugged with a plugging portion made of a plugging material filled into the cell, and the other end of each remaining cell opposite to the one end of the predetermined cell is similarly plugged with a plugging portion, in a part of the cells, a gap is formed between the plugging portion and the partition wall separating the plugging portion of a cell and the partition wall by a distance of 20 μm or more, a length of the gap in the axial direction is 50% or more and less than 95% of a length of the plugging portion in the axial direction, a length of the gap in a face perpendicular to the axial direction is 20% or more and 50% or less of a length of an inner peripheral surface of the cell, the face perpendicular to the axial direction is inside the cell away from the ends of the cell, and the gaps in the cells are formed in at least ⅓ of the plugging portions.