According to an embodiment of the present invention, a rear floor assembly comprises: a rear floor having a fuel tank portion provided with a fuel tank installed on a lower surface thereof, and having a mounting portion located at a lower end of the fuel tank portion and provided on an upper surface thereof; and a first support portion connected to the fuel tank portion and a peripheral portion of the mounting portion and supporting the rear floor. The mounting portion comprises: a mounting room on which an electric battery or a spare tire is mountable; and a second support portion installed on a lower surface of the mounting room and connected to the first support portion at an end thereof. Accordingly, the present invention enables a spare tire or an electric battery to be mounted without a change in a structure, and also enables improved stability to be expected in case of a rear collision.;COPYRIGHT KIPO 2017
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