The disclosure relates to a vehicle body structure safeguarding a fuel tank from damage resulting from collisions without greatly increasing the weight of the vehicle. The vehicle body structure includes a front floor under which a fuel cell stack case accommodating a fuel cell stack is disposed, and side sills and floor frames which extend along the sides of the vehicle, and on which a sub-frame for housing a fuel tank is installed. The front face of the sub-frame and the rear face of the fuel cell stack case are flat and oppose each other.