| 摘要 |
PROBLEM TO BE SOLVED: To provide a resin-made hollow molding which shows high cushioning property and a high degree of secure reinforcing effect and deformation preventing effect. SOLUTION: A rib 4 which projects from one of the walls 2 of a duct 1 to the other wall 3 in such a way that the rib 4 is spaced opposingly from the other wall 3 is provided. In addition, the other rib 5 is also provided which juts out of the other wall 3 of the duct 1 to the wall 2 in such a manner that the rib 5 is spaced opposingly from the wall 2.
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