A luggage board movement mechanism comprising: a luggage board movable between an upper position and a lower position inside a vehicle luggage compartment and configured to divide the luggage compartment into upper and lower parts; guide protrusions protruding laterally in a vehicle width direction from both side edges in the vehicle width direction on a vehicle front side of the luggage board; a guide part provided on each of side walls positioned on either side of the luggage compartment in the vehicle width direction, and configured to guide the guide protrusions when the luggage board moves between the upper and lower positions; and a support part provided on the side wall of the luggage compartment and configured to support the luggage board, wherein the guide part includes a lower guide section inclined such that a vehicle rear side thereof is positioned above a vehicle front side thereof, and an upper guide section extending toward the front of the vehicle from the end of the lower guide section on the vehicle rear side, characterized in that: the support part is provided on each side wall of the luggage compartment more toward the rear of the vehicle than an intersection part between the lower guide section and the upper guide section on the vehicle rear side, and an upper communicating section, which allows movement of the guide protrusions during vertical swing of the luggage board with the support part as a pivot point, is provided in the intersection part, and the support part is provided near the vehicle rear side of the upper communicating section. a luggage board movable between an upper position and a lower position inside a vehicle luggage compartment and configured to divide the luggage compartment into upper and lower parts; guide protrusions protruding laterally in a vehicle width direction from both side edges in the vehicle width direction on a vehicle front side of the luggage board; a guide part provided on each of side walls positioned on either side of the luggage compartment in the vehicle width direction, and configured to guide the guide protrusions when the luggage board moves between the upper and lower positions; and a support part provided on the side wall of the luggage compartment and configured to support the luggage board, wherein the guide part includes a lower guide section inclined such that a vehicle rear side thereof is positioned above a vehicle front side thereof, and an upper guide section extending toward the front of the vehicle from the end of the lower guide section on the vehicle rear side, a lower guide section inclined such that a vehicle rear side thereof is positioned above a vehicle front side thereof, and an upper guide section extending toward the front of the vehicle from the end of the lower guide section on the vehicle rear side, characterized in that: the support part is provided on each side wall of the luggage compartment more toward the rear of the vehicle than an intersection part between the lower guide section and the upper guide section on the vehicle rear side, and an upper communicating section, which allows movement of the guide protrusions during vertical swing of the luggage board with the support part as a pivot point, is provided in the intersection part, and the support part is provided near the vehicle rear side of the upper communicating section. the support part is provided on each side wall of the luggage compartment more toward the rear of the vehicle than an intersection part between the lower guide section and the upper guide section on the vehicle rear side, and an upper communicating section, which allows movement of the guide protrusions during vertical swing of the luggage board with the support part as a pivot point, is provided in the intersection part, and the support part is provided near the vehicle rear side of the upper communicating section.