| 摘要 |
PROBLEM TO BE SOLVED: To provide an inorganic board with a joint having high holding strength and rocking strength of a joint part in the axial direction, eliminating the incompatibility of appearance near a seam of a joint to heighten the design. SOLUTION: In this inorganic board 1, the joints 2 and 3 are provided in the longitudinal direction and in the cross direction. The cross-direction joint 3 is shallower than the longitudinal joint 2, and near the seam of the cross- direction and longitudinal joints 2, 3, the bottom of the cross-direction joint 5 is connected to a gradient to the bottom 4 of the longitudinal joint.
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