A floor board positioned in the foot area of an occupant seated in an occupant seat is allowed to be driven up or down. In an automobile movable floor apparatus, a floor board 5 that covers the upper face of an automobile body floor 3 and a raising-lowering drive mechanism 6 that drives the floor board 5 to be raised or lowered are provided in the foot area of an occupant seated in an occupant seat 4, and a toe board portion 8 sloping down to the rear and a floor base portion 9 that extends toward the rear of the automobile body and is continuous with the rear end of the toe board portion 8 are provided in the automobile body floor 3. The floor board 5 includes a toe board corresponding portion 18 that corresponds to the toe board portion 8 of the automobile body floor 3, and a floor base corresponding portion 19 that corresponds to the floor base portion 9, and the toe board corresponding portion 18 and the floor base corresponding portion 19 are formed in a flattened V-like shape when viewed from the side.