To prevent a control panel as far as possible from wetting by rain or the like with a simple structure, in a portable engine generator mounting a generator driven by an engine and a fuel tank, storing fuel oil of the engine to be arranged upward the engine and the generator, in a frame, and fixedly arranging the control panel sideward the engine and the generator.

A tank cover 8 having a side plate 8a positioned in the outer sideward of a fuel tank T to cover it is mounted in a frame 5, a control panel is fixedly arranged in an inward side from the side plate 8a in a manner wherein a cavity 12 is formed between an upper end of the control panel and a lower end of the side plate 8a, a generator G is arranged in the frame in an attitude that its exhaust port 13 faces an upper end side of the control panel.