To reduce work manhours in a revolving super structure manufacturing line by fitting a valve unit, pilot valves and an operation bracket for supporting the pilot valves, in one lot to a revolving frame.

In a turning working machine, a revolving frame 8 is provided on a travel device rotatably around a vertical axis, and the revolving frame 8 is mounted with a valve unit 24 with a plurality of control valves connected in a group so as to control various hydraulic equipments, pilot valves 42 applying pilot pressure to the control valves of the valve unit 24, and an operation bracket 43 for supporting the pilot valves 42. In this case, a base 45 is provided to fit the valve unit 24 to the revolving frame 8, and the operation bracket 43 is connected to the base 45.