A camera monitor system includes: a capturing device; a displaying device; a detecting device detecting at least one of a state of an engine switch of a vehicle, a state of an engine, a state of a gear shift, an open/closed state of a door, and a seated state of a driver; and a control device controlling consumed power by the capturing device and the displaying device on the basis of at least one type of detection output of the detecting device. The control device controls at least one of the capturing device and the displaying device to a low power consumption state when a specified time elapses since the detection output of the detecting device is changed.