| 摘要 |
Keyhole-shaped embossed portion 13 formed by combination of circular embossed portion 11 and elliptic embossed portion 12 having a width smaller than a diameter of circular embossed portion 11, is formed to project from a lower side of rear seat underfoot floor panel 8L in a thickness direction of rear seat underfoot floor panel 8L (from the side of a road surface) toward an upper side thereof in the thickness direction (toward an inside of a vehicle compartment), thereby reinforcing underfoot floor panel 8L. Circular embossed portion 11 serves to uniformly reinforce underfoot floor panel 8L in every direction extending through a center of circular embossed portion 11, so that underfoot floor panel 8L can have a predetermined strength against a bending load applied to underfoot floor panel 8L in every direction, and there is no directional dependency of degree of reinforcement of underfoot floor panel 8L. Circular embossed portion 11 tends to generate buckling that causes displacement of a circular bottom surface in the thickness direction. However, elliptic embossed portion 12 extending from an outer circumference of circular embossed portion 11 in a radially outward direction of circular embossed portion 11 can suppress the buckling. |
