To provide a brush piece of a cleaning brush for a car washing machine having high cleaning performance preventing divided pieces formed of slits from sticking due to washing water and the like for a long time and the generation of a part left unwashed, and preventing freezing, a cleaning brush for a car washing machine arranged with the brush piece, and a car washing machine mounting the cleaning brush for the car washing machine.

The brush piece 1 of the cleaning brush for the car washing machine cleaning dirt and the like adhered to the washed surface of the outer surface of an automobile or a vehicle has a platy synthetic resinous foaming element 2. The synthetic resinous foaming element 2 has the divided pieces formed of the slits 3, and at least one or more recessed portions 5 or/and projecting portions 6 are formed in a forming area 8 of the slit 3.