A vehicle body structure includes a sill structure, a floor panel and a reinforcing bracket. The sill structure extends along a lower end of a door opening in a vehicle longitudinal direction. The floor panel is fixed to the sill structure. The reinforcing bracket has a first flange fixed to the sill structure, a second flange fixed to the floor panel and a mid-section that extends from the first flange to the second flange. The mid-section has a contoured surface with an overall surface length as measured along the contoured surface from the first flange to the second flange that is greater than a distance measured between the first flange and the second flange.