A quarter window (20) attached to a door frame (12) of a vehicle rear door (11) is disclosed. The quarter window includes a quarter window panel (21) and a window frame (31). The quarter window panel is made of a synthetic resin material. The window frame includes a division bar (32) and a scaling portion (33). The division bar is configured such that a glass run (15) can be fitted to the division bar, and the sealing portion includes, as a part, the division bar. The sealing portion is integrally coupled to the quarter window panel so as to extend along the periphery of a side of the quarter window panel that faces inside of the vehicle. A part of the sealing portion is capable of being fitted to the door frame. The quarter window panel and the window frame are integrally molded. The window frame is made of a synthetic resin having a high rigidity. A fixing portion (35) for fixing the window frame to the door frame is integrally formed with the window frame.