Headliner for vehicle roof with transparent portion

Headliner for vehicle roof with a transparent portion, wherein said headliner comprises an opening, having a perimeter, for receiving said transparent portion, and a rectangular plastic frame for reinforcement in a single part comprising:

• four straight segments and four curved segments distributed along the entire perimeter of the opening, such that each curved segment is connected to two of the straight segments,
• each one of said straight segments and curved segments comprises a first flange, substantially flat, attached to the headliner, and a second flange joined to the first flange along the entire length thereof and extending with respect to said first flange toward the vehicle roof;
• each one of the curved segments is provided in the first flange with a notch open towards the headliner, the notch having a curved edge without corners delimits the area of the notch such that the dimension d1 of the depth of the first flange in the notch is smaller than the dimension d2 of the depth of the notch.