A device for adjusting a view range of a vehicular monitoring device includes a vehicle status detector mounted on a turning portion of a vehicle for detecting a turning degree of the turning portion, and outputting an adjusting signal associated with the turning degree; and a controller in communication with the vehicle status detector and the vehicular monitoring device, controlling the vehicular monitoring device to move from an initial position to a working position in response to the adjusting signal. The working position varies with the turning degree.