Patent ID: 8100462

Claim:
A vehicle floor underframe, which is arranged under a cab including a driver's seat, said floor underframe comprising: a front section, which is deployed on the front side of the cab and extends along the length of the vehicle; a rising section, which bends at the back end of the front section and extends upward; a back section, which bends at the top end of the rising section and extends towards the rear of the vehicle and is deployed under the driver's seat; and a buckling section, which is formed in the back section and has stress concentration when a load from at least either the front end of the front section or the back end of the back section is applied in a compressing direction; wherein the back section comprises a front side and a rear side which are formed with another component, a rear end surface of the front side and a front end surface of the rear side are mutually opposed in a vehicle length direction, the buckling section comprises a connecting portion between the rear end surface of the front side and the front end surface of the rear side, the buckling section is deployed under approximately the center of the passenger seat along the length of the vehicle, and the back section bends and deforms upwards at the buckling section when a load is applied from at least either the front end of the front section or the back end of the back section in a compressing direction.