The invention relates to an engine-driven power generator. In the engine-driven power generator (10), a fan-equipped flywheel (25) and a drive shaft (48) of a power generation section (26) are connected to a crankshaft (31) of an engine, and the power generation section (26) is driven by the drive shaft (48) being driven via the crankshaft (31). The fan-equipped flywheel (25) is disposed between a crankcase (28) of the engine and the power generation (26) section, and small-diameter (52) and large-diameter (53) cooling fans for cooling the engine and power generation section are provided on the fan-equipped flywheel.