POWER GENERATION DEVICE

Provided is a power generation device capable of ensuring assemblability and ensuring strength/rigidity necessary when being handled, and having reduced size and weight, without using a reinforcement frame. The power generation device includes, in a casing 10, an alternator that generates power through driving of an engine, an inverter case 24 that houses an inverter of the alternator, and a fuel tank 12 that stores fuel for the engine, and the device includes an upper fixing part 40 that fixes an upper part of the fuel tank 12 to the casing 10, an intermediate fixing part 50 that fixes a lower part of the fuel tank 12 to an upper part of the inverter case 24, and a lower fixing part 70 that fixes a lower part of the inverter case 24 to the casing 10.