A window cover for an automobile integrally includes: a front sheet to cover an outer surface of an automobile windshield; and a pair of side sheets to cover outer surfaces of left and right front door glasses, respectively. The side sheets are fixed to a vehicle body by a fixing device. The device includes a plate-shaped tab fixed to a rear edge of each side sheet. The tab is fixed by being inserted into a clearance between a rear edge of each of the front door glasses and a front edge of a rear door glass of a rear door placed rearward of the rear edge. Accordingly, convenience is improved because the cover can be easily attached to the vehicle body with the front and rear doors remaining closed, and workability is not deteriorated because the cover is not twisted or entwined when the front doors are opened or closed.