In addition to improving security of data communication between a control device and a mobile terminal, to make it possible to easily make the data communication. A working machine of the present invention is provided with a control device that can make wireless communication with a mobile terminal 3 storing a mobile-use ID code and stores a working machine-use ID code, wherein the control device is provided with: ID code checking means 41 adapted to check the mobile-use ID code obtained by ID code obtaining means 40 and the working machine-use ID code with each other； data communication means 42 adapted, in the case where as a result of the checking by the checking means, matching between the ID codes is established, to allow data communication between the mobile terminal 3 and the control device, and in the case where the matching is not established, not to allow the data communication； and ID code registration means adapted to register the working machine-use ID code in the mobile terminal 3 as the mobile-use ID code.
