In an inverter generator having a winding wound around a generator unit driven by an engine, a converter connected to the winding and adapted to convert an alternating current outputted from the winding to a direct current, an inverter connected to the converter and adapted to invert the direct current outputted from the converter to an alternating current and output it, and a controller adapted to control operations of the converter and the inverter, a battery is connected to the engine, and the winding includes a first winding and a second winding, such that the controller supplies an output of the battery to one of the first winding and the second winding to rotate the generator unit to start the engine.