To provide a window glass cover for a car which is attached to a windshield of the car from the outer side so as to be used for sun shade and frost protection, free from any possibility of being blown by strong wind and capable of enhancing the convenience.

A vehicle body locking hook 5 is provided on a corner part of a glass cover sheet 2 via an elastic expandable member 4, and a locking mechanism is equipped on each vehicle body locking hook 5. During the service, the glass cover sheet 2 is fitted to the surface of the windshield 6a from the outer side of a car 6, four vehicle body locking hooks 5 are hooked to a vehicle body 6b, and the locking mechanism of each vehicle body locking hook 5 is operated. Since the glass cover sheet 2 can be fitted to the car 6 in one operation, fitting is simple and the convenience is excellent. The glass cover sheet 2 is firmly fixed to the vehicle body 6b by the four vehicle body locking hooks 5, and are not blown even being subjected to strong wind.