Provided is a vehicle lower portion structure including: a thin plate portion that configures a portion of a substantially plate-like rocker component member on the vehicle rear side of a center pillar, the rocker component member configuring at least part of a rocker extending in the vehicle front and rear direction; and a thick plate portion that configures a portion of the rocker component member on the vehicle front side of the center pillar and whose plate thickness is set thicker than that of the thin plate portion.