To eliminate labor for taking out and storing a cover, in a cover device for a windshield of an automobile.

The cover 1 of the device is provided with flexibility movable along a surface of the windshield. A retaining part 2 is a housing provided with a dimension that it can store the cover 1 in the state the cover 1 is elongated and is provided with a guide mechanism 3. The guide mechanism 3 is provided with a power source such as a motor provided on the retaining part 2, a power source and a power transmission part 5. The power transmission part 5 is provided with a plurality of teeth 51, 51 arranged in a longitudinal direction of the cover 1 and forwardly draws the cover 1 from a roof of the automobile or rearwardly draws it from a bonnet by rotating the gear 50 by the power source 4 and feeding the successively engaged teeth 51, 51.