Floor panel structure for a vehicle and vehicle body provided therewith

The panel area S10 is formed in the substantially rectangular shape with sides thereof which extend substantially straight, by being enclosed by the frame member 22, 28, 29 and the vibration restraint portion to control a vibration area, such as beads 56 and the bent line portion 54, and the high-rigidity area 60 and the low-rigidity area 62 are formed within the panel area S10. Accordingly, the vibration energy can be increased at the low-rigidity area 62 properly. As a result, the vibration energy transmitted from the frame members to the floor panel can be reduced, and thereby the acoustic emission generated from the floor panel can be reduced.