Patent ID: 7504359

Claim:
A honeycomb structural body comprising: at least one pillar-shaped porous ceramic member having a plurality of through-holes extending in a longitudinal direction of the at least one pillar-shaped porous ceramic member, the plurality of through holes partitioned by a plurality of partition walls, the through-holes being plugged at one end portion of the at least one pillar-shaped porous ceramic member, wherein the partition walls have a surface roughness of not less than 10 μm as a maximum roughness Rz defined in JIS B0601-2001 and an average pore size of 5-100 μm in a pore distribution measured by a mercury pressure method, and satisfy the following relationships: A≧ 90− B /20; and A≦ 100− B /20 when a ratio pores having a pore size of 0.9-1.1 times the average pore size to total pore volume is A (%) and a thickness of the partition walls is B (μm).