To provide a car body cover remarkably easy to install/remove it on/from a car body and house it in a short time, capable of being automatically installed/removed/housed by a cover sheet itself without using a special winding device, and furthermore, capable of automatically fixing the installed cover sheet.

This car body cover 1 for covering the car body A from over is formed from a flat sheet-like bag body 2 structured of a double-film material 2a sealed with the cover sheet for covering the top surface, both side surfaces and the front and the rear surfaces of the car body. The flat sheet-like bag body 2 is previously coiled or folded, and inflated into a shape along the shape of the car body by filling air into the sheet-like bag body 2, and returned to the original shape by discharging air. A lower end of the sheet-like bag body 2 is formed with lock parts 4 and 5 to get into a part under the car body, and when the sheet-like bag body 2 is inflated by the air, the lock parts 4 and 5 get into a part under the car body A.