Abstract: There is provided a honeycomb structure in which filtration efficiency of particulate matters (PM) in the exhaust gas is high, initial pressure loss is low and increase in pressure loss in accompanied with the trapping of PMs is suppressed. The honeycomb structure includes a plurality of cells partitioned by a plurality of partition walls which are made of silicon carbide porous ceramics and are lined up in a single direction, an average pore diameter of the partition walls measured by mercury porosimetry is 1 ?m to 15 ?m, a standard deviation in a pore diameter distribution is 0.20 or less when the pore diameter is represented by common logarithm, and percentage of the pores having the pore diameter of less than 2 ?m relative to the entire pores is 5 vol % or less.

Abstract: There is provided a honeycomb structure in which filtration efficiency of particulate matters (PM) in the exhaust gas is high, initial pressure loss is low and increase in pressure loss in accompanied with the trapping of PMs is suppressed. The honeycomb structure includes a plurality of cells partitioned by a plurality of partition walls which are made of silicon carbide porous ceramics and are lined up in a single direction, an average pore diameter of the partition walls measured by mercury porosimetry is 1 ?m to 15 ?m, a standard deviation in a pore diameter distribution is 0.20 or less when the pore diameter is represented by common logarithm, and percentage of the pores having the pore diameter of less than 2 ?m relative to the entire pores is 5 vol % or less.