Luggage Gap Cover Device for Vehicle Rear Seat

An embodiment luggage gap cover device for a rear seat of a vehicle is provided. The rear seat includes an interlocking frame connecting a seatback of the rear seat to a seat cushion for a dive operation, and the luggage gap cover device includes a foldable cover mat on a rear surface of the seatback configured to cover a gap between the seatback and a floor plate of a luggage compartment and a support protrusion on the interlocking frame, the support protrusion being configured to push and support the cover mat in a direction of covering the gap between the seatback and the floor plate.