To improve the efficiency and safety of driving by immediately allowing starting without re-authorizing organism information on an occasion considered unnecessary to re-authorize a driver from a viewpoint of security.

This driver authorization device is furnished with a camera to pick up a face image of a person seated in a driver's seat in a passenger car and a control part 4 connected to it. The control part 4 allows the driver to start an engine when the picked up face image of the person seated in the driver's seat picked up by the camera 5 and a previously registered face image are collated with each other and they are matched with each other. It is possible to start the engine without collation when the engine is once stopped and restarted and when the driver remains seated in the driver's seat.