| abstract |
A plugged honeycomb structure in which in a cross section of a honeycomb structure body which is perpendicular to an extending direction of cells, inflow cells are disposed to surround an outflow cell, and the number of the inflow cells is larger than the number of the outflow cells, and the cross section has a plurality of intersecting portions of partition walls each defining the inflow cells which are adjacent to each other, and in 60% or more of a total number of the intersecting portions, a relation between a diameter (D 1 ) of a circle inscribed in the intersecting portion and a diameter (D 0 ) of a circle inscribed in the partition wall defining the inflow cell and the outflow cell which are adjacent to each other satisfies D 1 /(√2×D 0 )=1.20 to 1.80 |