The ceramic honeycomb structural body comprises a pillar-shaped honeycomb structural porous ceramic member formed by arranging a plurality of through holes as a gas path side by side through partition walls or a combination thereof, in which the ceramic honeycomb structural body is a sintered body having a pore structure in which one or more peaks (the maximum value) exist in each region of a first pore group of pores having a pore size of about 0.05 μm to about 150 μm and of a second pore group of pores having a pore size of about 0.006 μm to about 0.01 μm.