An object detecting system includes a plurality of photographing mechanisms that are used to detect information about objects inside and outside a vehicle. An object detecting system is installed in a vehicle and comprises a first camera and a second camera to obtain information about objects inside and outside the vehicle. They system further includes a controller for conducting controls to detect information about an object and an electrical power unit to supply electrical power from a vehicle battery to the respective cameras. At least one of the controller and the electrical power unit is shared by the first camera and the second camera.