| 摘要 |
PROBLEM TO BE SOLVED: To suppress dissimilar metal members which are mutually joined together at a plurality of positions in a specific direction from being strained by heat in the specific direction while securing the rigidity thereof.SOLUTION: A rear package tray 3 includes a panel 10 made of a steel plate and a panel 20 made of an aluminum alloy plate having a larger coefficient of thermal expansion than the steel plate and put over the panel 10. The panel 10 has a first swell part 16 swelling away from the panel 20, a second swell part 17 further swelling from a top part thereof, and flange parts 18a, 18b at both ends of the first swell part 16. The center panel 20 has a plurality of bead parts 30 formed at a plurality of positions in a width direction and extending in a front-rear direction respectively. Both the panels 10, 20 are joined to each other by point-joining an extension part 28a and the flange part 18a at a position between mutually adjacent bead parts 30. |
