Airflow straightening structure of automotive vehicle

An airflow straightening structure of an automotive vehicle, in which a slit and a connection portion which includes no slit are provided at a rear-end edge portion of a cover having a substantially-flat airflow straightening face extending in a vehicle longitudinal direction such that the slit and the connection portion are aligned in a direction crossing the vehicle longitudinal direction,

• wherein said connection portion is positioned adjacently, in the direction crossing the vehicle longitudinal direction, to said slit, and
• a protrusion is provided at the airflow straightening face of the cover, the protrusion being configured to protrude in a direction away from the airflow straightening face of the cover and extend in the direction crossing the vehicle longitudinal direction,
• wherein said protrusion is positioned such that an area where said protrusion is provided at the airflow straightening face of the cover does not overlap an area where said slit is provided at the rear-end edge portion of the cover in the direction crossing the vehicle longitudinal direction, and
• said protrusion is configured to extend in the direction crossing the vehicle longitudinal direction from a position corresponding to an end portion, in the direction crossing the vehicle longitudinal direction, of said connection portion to a position corresponding to an opening edge portion, in the direction crossing the vehicle longitudinal direction, of the slit such that at least part of underfloor traveling air flowing down along the surface of the cover toward the protrusion is guided toward the slit by an end portion, in the direction crossing the vehicle longitudinal direction, of the protrusion which is positioned closely to the slit.