The invention provides a vehicle lower section structure. The vehicle lower section structure includes a battery unit that is disposed below a floor panel, a sliding door that is provided to a side section of a vehicle body, and a lower hinge that is attached to a lower portion of the sliding door, that supports the sliding door with respect to the vehicle body such that the sliding door is capable of sliding in a vehicle front-rear direction, and that is disposed further toward a vehicle upper side than the battery unit.