LOWER VEHICLE BODY STRUCTURE OF VEHICLE

PROBLEM TO BE SOLVED: To provide a lower vehicle body structure 2 of a vehicle 1 which can more efficiently transmit and disperse collision load from a side of a vehicle to a vehicle body lower part.SOLUTION: A lower vehicle body structure 2 of a vehicle 1 comprises a side sill 10, a rear wheel house 20, a floor panel 40, a rear side frame 50, a front side cross member 60 connected with the rear side frame 50, a rear side cross member 70, an impact bar 4 keeping a rear end at a rear end of the side sill 10 and a reinforcing member 30 for coupling the rear wheel house 20 to the side sill 10. The front side cross member 60 is arranged at a vehicle front side rather than the reinforcing member 30. The rear side cross member 70 is arranged at a vehicle rear side rather than the reinforcing member 30. Swollen parts 51 which are swollen toward the outside in a vehicle width direction from positions almost the same as the front side cross member 60 and rear side cross member 70 and abut on the side sill 10 at positions almost the same as the reinforcing member 30 are provided at the rear side frame 50.