| 摘要 |
PROBLEM TO BE SOLVED: To effectively prevent cracking, to reduce manufacturing man-hours and to improve quality of a manufacturing metal cover. SOLUTION: The metal cover of three-dimensional shape is composed by including a metal plate. In the metal plate, valley parts and raised parts are each extended in a first direction A1, and plural wary shapes 9 are constituted continuing alternately along a second direction A2 crossing the first direction A1, and each raised part has a height periodically changed along the first direction A1. In the metal cover, the first direction A1 is fixed in the direction crossing a principal ridge line 30 constituting the three-dimensional shape.
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