To prevent a machine from becoming incapable of operation and abnormal in its control system due to radio wave interference by adhering a film sheet, having a radio wave absorbing characteristic or a radio wave reflection characteristic to window panes of an operator's cabin that are made of a glass material with radio wave absorbing characteristic.

A lower glass pane 5b with a radio wave absorbing characteristic which is the same as an upper glass panel 5a with the radio wave absorbing characteristic is fixed or being openable to a window frame of a front face of an operator's cabin 5, and a glass pane 5c with the radio wave absorbing characteristic is provided to one side face of the operator's cabin 5, and glass panes with the radio wave absorbing characteristic are provided to the other side face and the rear face. An upper glass pane 6a with the radio wave absorbing characteristic and a lower glass pane 6b with the radio wave absorbing characteristic are fitted to window frames of an operator's boarding door 6. A film sheet, having radio wave absorbing characteristic or a radio wave reflection characteristic, is adhered to the inside or the outside of those window panes.