US Patent 9623908 Lower vehicle-body structure of vehicle

A tunnel side frame includes a U-shaped portion having a U-shaped cross section opening upward, the U-shaped portion comprising a bottom face portion, an outer face portion, and an inner face portion. A front tunnel member comprises a first face portion which faces to the bottom face portion of the tunnel side frame, a second face portion which faces to the inner face portion of the tunnel side frame, and a third face portion which extends inward from an upper end of the second face portion. The front tunnel member is attached to a vehicle body by attaching the first face portion to the bottom face portion of the U-shaped portion and attaching the third face portion to a floor tunnel.