To provide a ceramic honeycomb structure which can be produced with ease.

In the ceramic honeycomb structure 1 having a bulkhead part 2 which is made of a porous ceramic material and partitions a large number of cells penetrating in the axial direction and a sealing part 3 having a part sealing one end and a part sealing the other end, a sealing material 3 contains at least 70 wt.% of a ceramic material constituting the bulkhead part 2, the pore diameters of the part sealing one end and the part sealing the other end of the sealing part are smaller than the pore diameters of the bulkhead part, the ratio (P1/P0) of the porosity (P1) of the part sealing one end and the part sealing the other end of the sealing part to the porosity (P0) of the bulkhead part is at least 0.80 and below 1.00, and the length in the axial direction of the part sealing one end and the part sealing the other end of the sealing part is at least 0.5 mm.