PURPOSE: To improve the rigidity of the Mole vehicle body by utilizing an MH tank in an automobile provided with a hydrogen engine.

CONSTITUTION: At the approximately central part in the vehicle width direction of a floor panel 2, there is provided a tunnel part 2c which is eked out up and extends in the cross direction of a vehicle body. An MH tank T which stores hydrogen gas as fuel is extended in the cross direction of the vehicle body along the tunnel pt 2c in the lower see of the tunnel part 2c. It is thus possible to improve the rigidity of the whole vehicle body with a highly rigid member disposed at the central part of the vehicle body.