A rear floor assembly according to an embodiment of the present invention includes a rear floor having a fuel tank portion provided with a fuel tank on a lower surface thereof and having a mounting portion located on a lower surface of the fuel tank portion, And a first supporting part connected to the periphery of the mounting part to support the rear floor, wherein the mounting part comprises: a mounting room on which an electric battery or a spare tire can be mounted; And a second support portion connected to the second support portion.
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