A honeycomb structure 1 having numerous through channels passing through
along the X axis and being partitioned with porous partition walls 2 which
is characterized in that: a total pore volume (D) cc/g in end portions of the partition
walls 2 is smaller than the total pore volume in other portions of partition
walls 2; and relationships between the total pore volume (D) cc/g in end
portions and the partition wall thickness (B) m and cell pitch (C) mm in
other portions of partition walls are defined as; the total pore volume (D)the
partition wall thickness (B)0.004, and the total pore volume (D)(1/the
cell pitch (C))0.18; and a method of producing a honeycomb structure. There
is provided with the honeycomb structures 1 having various cell structures
and being reinforced at their end portions, with exhibiting satisfactory and practical
erosion resistance.