REPORTING DEVICE, VEHICLE, AND REPORTING CONTROL METHOD

reporting device mounted on a vehicle, comprises: a recognition processing unit configured to recognize an obstacle existing in front of the vehicle on the basis of information detected by a front detection unit and a risk target existing at least diagonally behind the vehicle on the basis of information detected by a rear detection unit; a sight line monitoring unit configured to determine whether or not a driver recognizes the obstacle or the risk target on the basis of an overlap between a sight line of the driver acquired on the basis of a captured image of the driver and the obstacle or the risk target; and a reporting control unit configured to report the existence of the obstacle or the risk target.