An engine operating device of a working machine includes a control assembly installed in a body, an operating lever mounted on a handle, and an operating cable. The control assembly includes a base member, a stop switch secured to the base member, and a lever member supported by the base member. The operating cable includes a throttle wire, a stop wire, and a cable tube in which the throttle wire and the stop wire are fitted. As the operating lever is moved to an engine stop position, the lever member moves to a release position, causing an engine to stop.