Abstract: An undercover structure is provided. The undercover structure includes a cover body portion formed with a notch and a lid portion covering the notch and integrally formed with the cover body portion. The lid portion is connected to the cover body portion through a first hinge portion in an openable and closable manner. The lid portion includes a flange portion. The flange portion extends to a side closer to the cover body portion than an edge of the notch. When the lid portion is in a closed state, the flange portion is overlapped with and fixed onto the cover body portion in a thickness direction of the cover body portion.

Abstract: A bottom structure of vehicle includes a vehicle body, with tires disposed on left and right sides thereof, and a chassis, covering a lower surface between left and right tires, and including a bottom plate surface, covering the lower surface, and an installation base, recessing from a bottom plate surface toward inner side of cabin. The installation base is disposed closer to the tire than center of vehicle body, is disposed closer to back of vehicle than a front part of tire, and includes an installation surface installing the chassis to the vehicle body, a front inclined surface, connected to the bottom plate surface and front of installation surface, and a back inclined surface, connected to back of installation surface and the bottom plate surface, having gentler tilt than the front inclined surface, and extending from installation surface toward back of vehicle and toward inner side in vehicle width direction.