1. An automotive environment monitoring device which monitors environment of a vehicle by using an image obtained from an imaging unit mounted on the vehicle, comprising: a first processing element which sets an area where an object exists in the image obtained from the imaging unit as a first area and a lower portion of the first area as a second area; a second processing element which extracts a feature of the object in the second area set by the first processing element; and a third processing element which identifies the object on the basis of an extraction result by the second processing element.