Floor reinforcement structure for vehicle body

Abstract

[Object] To provide a floor reinforcement structure for vehicle body which can achieve reduction in vehicle interior noise generated due to floor shaking and improvement in vehicle running stability by providing rigidity to an area around a joint portion between a main floor and a rear floor to thereby improve the vehiclebody rigidity and the rigidity against floor shaking. [Solving Means] Provided is a floor reinforcement structure for vehicle body including: a main floor 2 and a rear floor 3 provided in a vehicle front-and-rear direction; a side sill 4 being provided at each of left and right sides of the main floor 2 and the rear floor 3 in a vehicle width direction and extending in the vehicle front-iand-rear direction; a floor tunnel 5 of a hat-like cross-sectional shape protruding in an upper direction of the vehicle, the floor tunnel 5 being provided at a middle portion of the main floor 2 in the vehicle width direction and extending in the vehicle front-and-rear direction; and a vertical wall 6 being formed at a front side of the rear floor 3 and extending in a vehicle vertical direction. In this floor reinforcement structure for vehicle body, the vertical wall 6 of the rear floor 3 is formed into a continuous shape having no steps. A half of a height I-11 of a top face of the vertical wall 6 of the rear floor 3 is larger than a height H2 of a top face of the side sill 4, and a half of the height H2 of the top face of the side sill 4 is larger than a height H3 of a top face of a rear end portion 15 the floor tunnel 5.