A camera device includes a case having a first camera and a second camera arranged therein. The case is assembled from a first and a second half-case. The first camera is used to shoot images of the driver inside a car and the second camera is used to shoot images of the road in front of the car. The camera device also includes a mounting mechanism that allows adjustment of the case of the camera device to different orientations. Therefore, when the camera device is installed in a car, the first and second cameras can be adjusted to a desired shooting angle and images inside and outside the car can be synchronously shot and be used in an accident to determine which party should be responsible for the accident.