Vehicle body floor structure

A vehicle body floor structure comprising:

• a plurality of first vehicle body framework members extending along a vehicle body front-rear direction;
• a plurality of second vehicle body framework members extending along a vehicle width direction;
• a floor panel to which each of the first vehicle body framework members and the second vehicle body framework members is joined, the floor panel including a plurality of steps having ridge lines extending along a short-side direction of a first region, the steps being arrayed along a long-side direction of the first region, the first region being surrounded by the first vehicle body framework members that are adjacent to each other in the vehicle width direction and the second vehicle body framework members that are adjacent, to each other in the vehicle body front-rear direction;
• and
• a vibration damping material applied to a surface of the floor panel, the vibration damping material being applied along at least one outer edge portion of the first region among outer edge portions extending along the long-side direction and outer edge portions extending along the short-side direction.