A portable storage cart is needed for storing an automobile rooftop that is removable from the vehicle. The foldable storage cart of this invention securely and conveniently transports and stores a vehicle rooftop when it is not on the vehicle. The foldable storage cart includes a base and two generally planar support panels. The base and support panels form a triangle in an upright supporting position. A rooftop is received and supported on a portion of the base and one of the support panels. At least one of the support panels is hingedly connected to the base such that the storage cart folds into an essentially flat position where the second support panel can be nested between the base and the first support panel. In the folded storable position, the storage cart is easily stored out of a user's way while the rooftop is placed on the vehicle.