PROBLEM TO BE SOLVED: To prevent ventilation from occurring because the air around the lower part of a brim portion and the eyeglass-type protective device is warmed by the user's body temperature, exhalation, etc. when the glasses-type protective device is stopped with a hat. , It becomes cloudy easily. In order to solve this, there are a method of duplicating the lens, a method of applying an anti-fog chemical, and a method of applying a coating having an anti-fog effect to the lens, but the cost is high and the effect is not sustainable. Therefore, a device for promptly ventilating the warmed air and lowering the body temperature of the forehead portion is provided. SOLUTION: A switch for adjusting wind power, a voltage adjusting circuit, a control box having a built-in battery, a clip for fixing a device to a brim 9 portion of a hat 10, a small axial flow fan, a control box, a clip, and a small axial flow fan are connected. An anti-fog effect is obtained by attaching a device consisting of a frame and ventilating the lower part of the brim of the hat and the area around the glasses-type protective equipment. [Selection diagram] Fig. 1
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