| 摘要 |
A honeycomb structure includes a first end face, a second end face disposed opposite the first end face along a longitudinal direction of the honeycomb structure, and a honeycomb unit. The honeycomb unit has plural cell walls extending along the longitudinal direction to define plural cells. The honeycomb unit includes 50 to 60 mass% of zeolite, 15 to 25 mass% of inorganic fibers, and 20 to 32 mass% of alumina that is not contained in the inorganic fibers. An opening ratio Y(%) of the honeycomb unit satisfies an expression 57‰¤Y‰¤0.7X+25, where X (mass%) is a zeolite content of the honeycomb unit.
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