A canopy installation member for installing a canopy is firmly fixed on a rotation table frame. A rotary working machine having a working machine installed at the front of a rotation table frame (5), an engine (8) mounted on the rotation table frame (5), and a canopy detachably installed at the rear of the rotation table frame (5), wherein the engine (8) is placed and fixed on the rotation table frame (5) with a horizontally placed frame-like engine support member (31a, 31b) interposed between the engine and the frame, and a canopy installation member (32a, 32c) is raised at one side of the engine support member (31a, 31b).