VEHICLE BODY LOWER PART STRUCTURE

A vehicle body lower part structure includes: a floor panel; and a vehicle body frame member including a frame body, an inner side wall, a joint flange projecting inward in a vehicle width direction from an inner surface of the inner side wall in the vehicle width direction, and having a joining surface on which an end of the floor panel in the vehicle width direction is stacked and to which the end of the floor panel in the vehicle width direction is joined, and a recess provided to the frame body, recessed outward in the vehicle width direction from the inner surface of the inner side wall in the vehicle width direction, and having a surface that is continuous and flush with the joining surface of the joint flange. 本发明的车身下部构造包括地板面板和车身骨架构件，所述车身骨架构件包括：骨架主体部；内侧纵壁部；接合凸缘部，向比所述内侧纵壁部的车辆宽度方向内侧的面靠所述车辆宽度方向内侧伸出，具有供所述地板面板的所述车辆宽度方向的端部重叠且与所述地板面板的所述车辆宽度方向的所述端部接合的接合面；以及凹部，设于所述骨架主体部，从所述内侧纵壁部的所述车辆宽度方向内侧的面向所述车辆宽度方向外侧凹陷，并且具备与所述接合凸缘部的所述接合面在同一平面上连续的面。