A vehicle body 10 includes right and left floor frames 16 and right and left side sills 13, all extending in a longitudinal direction of the vehicle body, are disposed in parallel with each other, and right and left front side frames 11 extend forward from front ends of the right and left floor frames 16. Rear end sections 75 are butted to the side sills 13 such that the rear end sections approach the side sills 13, and are joined to the side sills 13 at longitudinal midpoints of the side sills 13. A cross member 22 spans across the right and left side sills 13 at positions forward of the joint sections and in the vicinity of the joint sections. A joint section 85 at the side sill 13, the floor frame 16, and the cross member 22 is formed into a substantially triangular shape in plan view.