To surely prevent a user from forgetting to take out changes in a self-service car washing machine in which the user performs car washing reception and the fare adjustment of a car washing in a car washing reception device.

The car washing machine comprises a change detection means for detecting the existence or non-existence of the change paid out at a return port 20 of a washing reception device 4, an inform means for informing the takeout of the change, and a control means for controlling to urge the takeout of the change by the inform means based on the output signal of the change detection means, and informs the remainder of the change and starts the car washing in such a state that the change does not remain in the return port.