A vehicle body lateral structure includes a rear strake which is provided with a mounting part for being mounted on a plate-shaped member of a side sill through a rear inner fender, a bolt fastening surface which protrudes from the mounting part by a first protrusion amount toward the front of the vehicle, and a bolt through-hole which opens from the bolt fastening surface toward the front of the vehicle. The rear inner fender includes a cut-out section which has a larger diameter than the bolt fastening surface. A stepped bolt includes in its axial direction, a screw portion which screws into a nut fixed to the plate-shaped member of the side sill, a small-diameter cylindrical portion, and a flange portion which has a smaller diameter than the bolt fastening surface.