Patent ID: 8235699

Claim:
A honeycomb structure-forming die comprising a die substrate having a first plate-shaped member provided with back holes formed for introducing a raw forming material and a second plate-shaped member provided with slits for forming the raw forming material into a lattice shape, wherein the first plate-shaped member has a plurality of columnar portions where at least a part is zoned by a slit-shaped groove portion corresponding with a shape of the slit on a bonding face side where the first plate-shaped member is bonded with the second plate-shaped member, and in the columnar portions, the ratio (L/T) of the height L of the columnar portions to the minimum width T in an end face on the bonding face side is within the range from 1/3 to 3.5, the height L is in the range of from 0.5 to 2.9 mm, and the minimum width T is in the range of from 0.23 to 1.08 mm.