VEHICLE-BODY STRUCTURE OF A VEHICLE AND VEHICLE

The floor panel vibration is reduced by suppressing a mode in which an entire region surrounded by a plurality of frame members in a floor panel 10 vibrates, the floor panel 10 to which vibration is transmitted from an engine or/and a suspension via vehicle-body framework members includes: a flange portion 11, which is formed in a planar shape on panel outer peripheral edge and to which the vehicle-body framework members are joined along the panel outer peripheral edge; a curved surface portion 12 that is curved such that a place closer to a panel central side bulges out more to a lower side in a continuous manner from a panel-central-side edge portion 14 of the flange portion 11; and a flat surface portion 13 that extends to the panel central side from the panel-central-side edge portion 14 of the curved surface portion 12 in a continuous manner.