To prevent an automobile from running over a tire stopper device when moved into by displacing a push-up member to push up the tire stopper to be protruded on the installation plan of a car washing machine when the car washing machine body is located at the position of starting washing.

During making ready for car washing prior to starting washing, a car washing machine body 1 is stopped at a preset position, where the second wheel 11 runs over the rear of a push-up member 7 and a bar member is moved up. With the movement of the bar member, a tire stopper 6 is lifted up and held in a rising condition. A vehicle 4 is moved into a car washing machine for washing and stopped at a position, where front tires 8 contact the tire stopper 6. As the tire stopper 6 is in the rising condition, it is difficult that the front tires 8 run over and it is sure that a driver is informed of a stop position.