Lower body structure of vehicle

A lower body structure of a vehicle including a first-row seat and a second-row seat from a front of the vehicle, the lower body structure comprising:

• a left and right pair of left seat rails and a left and right pair of right seat rails configured to make left and right seats of the second-row seat independently slidable;
• a first cross structure including securing portions to which the left seat rails and the right seat rails are secured;
• a second cross structure disposed apart from the first cross structure in a vehicle fore-and-aft direction;
• and
• a first coupling structure that couples the first cross structure and the second cross structure to each other in the vehicle fore-and-aft direction,
• wherein the first coupling structure is located between the securing portion located on a left side of the right seat rails and the securing portion located on a right side of the left seat rails in a vehicle width direction, and
• wherein the first coupling structure is aligned, in the vehicle fore-and-aft direction, with the securing portion located on the left side of the right seat rails and the first coupling structure is aligned, in the vehicle fore-and-aft direction, with the securing portion located on the right side of the left seat rails.