Floor structure of a vehicle body

The present invention relates to a floor structure of a vehicle body with a bottom plate (10) having a with respect to a front foot portion (12) formed one in the vehicle vertical direction (z) seat connection portion (14) and provided one below the bottom plate (10) support structure (16) having two extending substantially in the vehicle longitudinal direction (x) and in the vehicle transverse direction (y) spaced-apart longitudinal structures (18, 20), wherein below the seat connection portion (14) with the total area of ​​the seat connection portion (14) corresponding, integrally formed cross-member structure (22) with the in the vehicle transverse direction (y) opposite longitudinal structures (18, 20) is connected.