An engine-driven portable generator using an inverter may still generate a voltage at its output terminals even though the engine is stopped. In view of this problem, the invention is to provide a portable generator, which is intended to prevent any residual voltage from generating between the output terminals. That is, a portable generator rectifying once an AC voltage into a DC voltage, converting the DC voltage into a single-phase AC voltage, and outputting the single-phase AC voltage, which has an output-stop-control unit (443) that, when an operating switch (305) is turned off, stops the operation of the inverter circuit at the timing when the voltage between the output terminals drops to 0, is provided.