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A honeycomb structure body has a plurality of hexagonal cells of a hexagonal shape formed in a lattice arrangement. Each hexagonal cell is surrounded by its hexagonal cell wall composed of six sides. On a cross-sectional surface along the axis direction of the ceramic honeycomb structure body, each

A honeycomb structure body has a plurality of hexagonal cells of a hexagonal shape formed in a lattice arrangement. Each hexagonal cell is surrounded by its hexagonal cell wall composed of six sides. On a cross-sectional surface along the axis direction of the ceramic honeycomb structure body, each side in the six sides forming the hexagonal cell wall surrounding the corresponding hexagonal cell is a concave shape toward either the inside of or the outside of the hexagonal cell. In particular, it is preferred that continuous three sides in each hexagonal cell wall has a concave shape that is concave toward either the inside or the outside of the hexagonal cell, and the remaining continuous three sides in the cell wall has a concave shape that is concave toward the opposite direction to the direction of the concave shape formed by the above continuous three sides.

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What is claimed is: 1. A honeycomb structure body comprising: a plurality of hexagonal cells formed in a lattice arrangement, each hexagonal cell having a hexagonal cross-sectional shape surrounded by a hexagonal cell wall of a hexagonal cross-sectional shape composed of six sides, wherein each sid

What is claimed is: 1. A honeycomb structure body comprising: a plurality of hexagonal cells formed in a lattice arrangement, each hexagonal cell having a hexagonal cross-sectional shape surrounded by a hexagonal cell wall of a hexagonal cross-sectional shape composed of six sides, wherein each side of the hexagonal cell wall has a single concave shape so as to be concave only toward an inside or only toward an outside of the hexagonal cell in a cross-sectional plane of the honeycomb structure body, transverse to an axis direction of the honeycomb structure body, three consecutive sides of each hexagonal cell wall being concave only toward the inside of the hexagonal cell, and the remaining three consecutive sides of each hexagonal cell being concave only toward the outside of the hexagonal cell. 2. A honeycomb structure body comprising: a plurality of hexagonal cells formed in a lattice arrangement, each hexagonal cell having a hexagonal cross-sectional shape surrounded by a hexagonal cell wall of a hexagonal cross-sectional shape composed of six sides, wherein each side of the hexagonal cell wall has a single concave shape so as to be concave only toward an inside or only toward an outside of the hexagonal cell in a cross-sectional plane of the honeycomb structure body, transverse to an axis direction of the honeycomb structure body, wherein adjacent sides in the six sides of the hexagonal cell wall are concave only toward the inside and only toward the outside of the hexagonal cell, respectively, whereby the sides of the hexagonal cell wall respectively alternate, about a circumference of the hexagonal cell, between being concave only toward the inside and being concave only toward the outside. 3. The honeycomb structure body according to claim 1, wherein each side of the hexagonal cell wall is composed of a plurality of cell wall segments, the cross-section of each of said cell wall segments in said cross-sectional plane being a straight line, the straight cell wall segments collectively forming said concave shape. 4. The honeycomb structure body according to claim 2, wherein each side of the hexagonal cell wall is composed of a plurality of cell wall segments, the cross-section of each of said cell wall segments in said cross-sectional plane being a straight line, the straight cell wall segments collectively forming said concave shape. 5. The honeycomb structure body according to claim 1, further comprising an outer peripheral skin part formed on an outer surface of the honeycomb structure body. 6. The honeycomb structure body according to claim 2, further comprising an outer peripheral skin part formed on an outer surface of the honeycomb structure body. 7. The honeycomb structure body according to claim 1, wherein a thickness of each side of the hexagonal cell wall is within a range of 30 μm to 110 μm. 8. The honeycomb structure body according to claim 2, wherein a thickness of each side of the hexagonal cell wall is within a range of 30 μm to 110 μm. 9. The honeycomb structure body according to claim 1, wherein a thickness of each side of the hexagonal cell wall is 90 μm, a cell pitch of the hexagonal cells is 111 μm, a longitudinal length of the honeycomb structure body is 100.0 mm, an outer diameter of the honeycomb structure body is 103.0 mm. 10. A honeycomb structure body comprising: a plurality of hexagonal cells formed in a lattice arrangement, each hexagonal cell having a hexagonal cross-sectional shape surrounded by a hexagonal cell wall of a hexagonal cross-sectional shape composed of six sides, wherein each side of the hexagonal cell wall has a concave shape toward one of an inside and an outside of the hexagonal cell in a cross-sectional plane of the honeycomb structure body, transverse to an axis direction of the honeycomb structure body, three consecutive sides of each hexagonal cell wall having a concave shape that is concave toward the inside of the hexagonal cell, and the remaining three consecutive sides of each hexagonal cell having a concave shape that is concave toward the outside of the hexagonal cell, and wherein a thickness of each side of the hexagonal cell wall is 90 μm, a cell pitch of the hexagonal cells is 111 μm, a longitudinal length of the honeycomb structure body is 100.0 mm, an outer diameter of the honeycomb structure body is 103.0 mm. 11. The honeycomb structure body according to claim 10, wherein each side of the hexagonal cell wall is composed of a plurality of cell wall segments, the cross-section of each of said cell wall segments in said cross-sectional plane being a straight line, the straight cell wall segments collectively forming said concave shape. 12. The honeycomb structure body according to claim 10, further comprising an outer peripheral skin part formed on an outer surface of the honeycomb structure body. 13. A honeycomb structure body comprising: a plurality of hexagonal cells formed in a lattice arrangement, each hexagonal cell having a hexagonal cross-sectional shape surrounded by a hexagonal cell wall of a hexagonal cross-sectional shape composed of six sides, wherein each side of the hexagonal cell wall has a concave shape toward one of an inside and an outside of the hexagonal cell in a cross-sectional plane of the honeycomb structure body, transverse to an axis direction of the honeycomb structure body, wherein adjacent sides in the six sides of the hexagonal cell wall are concave toward the inside and outside of the hexagonal cell, respectively, whereby the sides of the hexagonal cell wall respectively alternate, about a circumference of the hexagonal cell, between being concave to the inside and concave to the outside, and wherein a thickness of each side of the hexagonal cell wall is 90 μm, a cell pitch of the hexagonal cells is 111 μm, a longitudinal length of the honeycomb structure body is 100.0 mm, an outer diameter of the honeycomb structure body is 103.0 mm. 14. The honeycomb structure body according to claim 13, wherein each side of the hexagonal cell wall is composed of a plurality of cell wall segments, the cross-section of each of said cell wall segments in said cross-sectional plane being a straight line, the straight cell wall segments collectively forming said concave shape. 15. The honeycomb structure body according to claim 13, further comprising an outer peripheral skin part formed on an outer surface of the honeycomb structure body.