To provide a parked vehicle protection device at asbestos treatment time, which covers a whole parked vehicle, when executing asbestos treatment which prevents an asbestos structure from becoming powder dust by spraying a chemical capable of preventing the asbestos structure from becoming the powder dust in a multistory parking garage, and a parked vehicle protection method.

The parked vehicle C is covered with a vehicle cover 11, and the bottom section protection pad 12 of the vehicle C has a width wide enough to be inserted between right and left front wheels, and between right and left rear wheels, and has a length nearly corresponding to the whole length of the vehicle C, and includes: a vehicle bottom face application pad 13 which is elastically deformed while being matched with a vehicle bottom face to be adhered to it, when it is lifted from an inserted state into the lower side of the vehicle C and pressed to the vehicle bottom face; a plane maintaining panel 14 which is stacked and formed under the pad 13, and which maintains the lower face of the vehicle bottom face application pad 13 in a plane form, when the vehicle bottom face application pad 13 is pressed to the vehicle bottom face; and a caster 15 as a running means attached to the lower face of the plane maintaining panel 14.