1. An automatic work apparatus which detects spatial position of targets based on images thereof taken by means of plural observing camera devices that have lenses of non-central projection such as fisheye lenses set therein and carries out predetermined tasks comprising: a rotation device to change viewing direction of said observing camera devices; a target image extracting unit to extract said targets in said images taken by means of said plural observing camera devices; and a rotation controller to control said rotation device in accordance with a certainty obtained by discriminating the target position information in response to target position that is specified by said target image extracting unit for each of said images of said targets.