To manufacture easily a honeycomb structure in which a plurality of through holes and a blocked hollow part lying between the through holes are formed.
A mold 30 to obtain a honeycomb molding has: a bottom mold 38 in which a plurality of columnar projections 34 project from a lower substrate 36; a hollow intermediate mold 40 in a frame shape; and a top mold 46 in which a plurality of tapered projections 42 are provided on an upper substrate 44. The insertion into the intermediate mold 40 by both of the columnar projections 34 and tapered projections 42 constitutes the mold 30, and at the same time, forms a cavity inside the mold 30. A slurry is introduced into the cavity. A through hole having a shape corresponding to the shape of the columnar projection 34, and a hole having a bottom of the shape corresponding to the shape of the tapered projection 42, are formed on the honeycomb molding obtained by a solidification of the slurry. The opening of the hole having the bottom is blocked by a blocking material or a viscous body. When the blocking is carried out by the blocking material, a coating agent curable without carrying out a calcination treatment, may be applied.
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