A vehicle cleaner system mounted on an autonomous driving vehicle including a vehicle control unit capable of selectively executing an autonomous driving mode in which an accelerator control signal, a brake control signal, and a steering control signal are generated in accordance with an output from an external sensor acquiring information on outside of the vehicle and a manual driving mode in which the accelerator control signal, the brake control signal, and the steering control signal are generated independently of the output from the external sensor, the vehicle cleaner system comprising: a cleaner unit configured to clean the external sensor; and a cleaner control unit configured to control the cleaner unit, wherein the vehicle control unit is configured to switch from the manual driving mode to the autonomous driving mode after the cleaner control unit causes the cleaner unit to clean the external sensor or after a diagnosis determines that the external sensor need not to be cleaned, characterized in that the vehicle cleaner system further comprises a switching advanced notification acquiring unit configured to acquire a switching advanced notification signal for notifying that the vehicle is entering an area in which a driving mode is capable of switching from the manual driving mode to the autonomous driving mode, wherein the cleaner control unit is configured such that, when the switching advanced notification acquiring unit has acquired the switching advanced notification signal, the external sensor is cleaned by the cleaner unit or the diagnosis is performed to ascertain whether or not the external sensor needs to be cleaned, and the cleaner control unit is configured to acquire the switching advanced notification signal, from a navigation system, a wireless communication unit or an image recognition unit for notifying that the vehicle is entering an area in which the autonomous driving mode is executable. a cleaner unit configured to clean the external sensor; and a cleaner control unit configured to control the cleaner unit, wherein the vehicle control unit is configured to switch from the manual driving mode to the autonomous driving mode after the cleaner control unit causes the cleaner unit to clean the external sensor or after a diagnosis determines that the external sensor need not to be cleaned, characterized in that the vehicle cleaner system further comprises a switching advanced notification acquiring unit configured to acquire a switching advanced notification signal for notifying that the vehicle is entering an area in which a driving mode is capable of switching from the manual driving mode to the autonomous driving mode, wherein the cleaner control unit is configured such that, when the switching advanced notification acquiring unit has acquired the switching advanced notification signal, the external sensor is cleaned by the cleaner unit or the diagnosis is performed to ascertain whether or not the external sensor needs to be cleaned, and the cleaner control unit is configured to acquire the switching advanced notification signal, from a navigation system, a wireless communication unit or an image recognition unit for notifying that the vehicle is entering an area in which the autonomous driving mode is executable.