When receiving no reverse state signal, which indicates that a vehicle is in reverse, a wash control circuit allows the actuation of the wiper motor by the interlocking operation and retains a changeover valve device on the side of the window washing nozzle. When receiving a reverse state signal, the wash control circuit switches the changeover valve device from the window washing nozzle to a camera washing nozzle and inhibits the actuation of the wiper motor by the interlocking operation.