Vehicle body lower portion structure

A vehicle body lower portion structure comprising:

• an underbody at which standing walls are provided to stand upward in a vehicle up-down direction from both ends in a vehicle front-rear direction at a floor portion:
• a load transmitting member, a length direction thereof being along a vehicle transverse direction and a cross-section thereof orthogonal to the length direction being a closed cross-sectional structure, is joined to the underbody in a state that a flat surface of the load transmitting member planarly-contacting a surface that faces outward in the vehicle front-rear direction of at least one of the standing walls;
• and
• an impact absorbing member, a length direction thereof being along the vehicle transverse direction is formed in a box shape and opens toward a load transmitting member side and is closed at an opposite side in the vehicle front-rear direction to the load transmitting member side, the impact absorbing member is joined, at a flange that projects-out from an open end thereof, in a planarly-contacting state to a flat surface at an opposite side in the vehicle front-read direction to an underbody side of the load transmitting member.