To provide a small and simple electric generator device and an electric generating system using the generator device, which are mainly directed to a limited area of about 10 to 20 general houses, will not cause environmental pollutions with a simple structure, and can efficiently generate electricity.

This device comprises a casing 1, inside which a blade 6 is rotatably assembled; a generating mechanism, which is installed on the casing 1 and generates electricity by rotation of the blade 6; a pressurizing pump 3, which is installed on the casing 1 and supplies high pressure water to the blade 6; a water tank 2 installed below the casing 1; and a water absorption hose 16 for connecting the pressurizing pump 3 with the water tank 2.