An extensible car window shading apparatus mountable inside the car and comprising a first plurality of slats having at each longitudinal end a slat hole in which a slat spring attached to a slat stick is inserted, such that the slat stick extends outwardly from the slat hole, a second plurality of panels, the second plurality being exactly twice the first plurality, such that there is a panel at each longitudinal end of each slat, wherein each panel has a panel hole in which a panel spring is inserted, the panel hole being configured to receive the slat stick, and wherein the panels on each side of the apparatus are joined by hinges, such as to allow folding or deploying of the extensible car window shading apparatus by a user, and a support arm that keeps the extensible car window shading apparatus in folded position.