Patent ID: 7540898

Claim:
A honeycomb structured body, comprising: a plurality of porous ceramic members combined with one another through an adhesive layer, each of the porous ceramic members having a plurality of cells in parallel with one another in a longitudinal direction of the cells with a wall portion interposed between adjacent cells, and each cell having either one end of its two ends sealed and a catalyst supporting layer adhering to said wall portion, wherein pores in said porous ceramic member comprise large pores having a pore diameter of 30 μm to 100 μm, small pores having a pore diameter of less than 30 μm, and ultra large pores having a pore diameter exceeding 100 μm, and the thickness of the catalyst supporting layer is X 1 (μm), and the value obtained by multiplying the porosity (%) of said porous ceramic member by the ratio of the average pore diameter of said large pores to the average pore diameter of said small pores is Y 1 , X 1 and Y 1 satisfy the following inequalities (1) and (2): 6 X 1 +80.5 ≦Y 1 ≦6 X 1 +230.5 (1) −6 X 1 +330 ≦Y 1 ≦−6 X 1 +474 (2).