The present invention relates to a ventilation device, in particular to a ventilation device that minimizes local
irritation to specific body parts such as the
anus, maximizes ventilation effect, reduces
foreign body sensation, and has excellent fixing force, enabling obese people and people who work in a sedentary manner or who sweat a lot to live a comfortable life. To this end, the present invention provides a
buttocks groove ventilation device, characterized in that it includes: a ventilation frame made of elastic material, inserted along the
buttocks groove along the length direction to open the
buttocks groove; the ventilation frame includes: an elliptical frame, a plurality of slender frames arranged at elliptical intervals to form an elliptical cross-section and its entire appearance forms a gentle arc, and a straight frame, a slender frame is arranged at intervals along the outer circumference of the elliptical frame and laterally passes through the plurality of elliptical frames to connect the plurality of elliptical frames to each other; as an additional embodiment, it also includes: a ventilation
skin made of
fiber material, covering the entire exterior of the ventilation frame to prevent direct contact between the
skin and the ventilation frame.