It solves the problems, such as: the autonomous travel servicer of control unit being provided, allows for autonomous travel servicer in order to efficiently do work in this way, include arrow path region wide path region in workspace.SOLUTION: the autonomous travel servicer of control unit 31 includes magnetic field strength detection device, the intensity in the magnetic field of induction is detected by flowing through region line, traveling controller 311, detected value of this method based on control stroke, so that the servicer of magnetic field strong detecting instrument turns to and travel operation area can linearly move, each servicer reaches region line, arrow path judging device 312, when the magnetic field strength of detected value induces arrow path region until servicer that detector obtains makes the second circle successively be greater than preassigned threshold value with the first rotation and be based on minimum-B configuration intensity, or when the detector that the magnetic field strength of detected value obtains successively continuously is greater than threshold value more than predetermined amount of time with first corner, determine the arrow path region that this servicer is advanced.In selected attached drawing: Fig. 7COPYRIGHT:(C) 2016, JPO& INPIT
