The engine control apparatus includes a governor control mechanism for keeping the engine frequency constant, decides the “presence” or “absence” of the engine load by the throttle aperture and forcibly changes the engine frequency to a predetermined frequency depending on the presence or absence of the load, the engine control apparatus includes an engine controlling unit (10) for controlling fuel supply to an engine (1), an engine temperature detecting unit (4) for detecting an engine temperature of the engine (1), and a threshold changing unit (10a) for changing each throttle aperture as a threshold for deciding the “presence” or “absence” of an engine load depending on the engine temperature detected by the engine temperature detecting unit (4).