To provide a window assembly having a seal member capable of restraining generation of a friction sound with a simple structure.

This window assembly includes a window panel 21 for blocking up an opening 17 and the resin seal member 22 integrally molded in a side edge part of the window panel, and is characterized in that the seal member has a base part 28 extended along the side edge part of the window panel and a lip part 31 projected in the base part and extended along the base part, and the base part and the lip part include polyolefin-based thermoplastic elastomer simultaneously and integrally molded by injection molding.