The present invention relates to a sinker using air buoyancy. Currently, a float is required to be adjusted for fishing, but a sinker is made of lead, which is harmful to the environment, while being the best material for adjusting the weight of the sinker. The sinker of the present invention is made mainly of steel. In other words, a user is able to just turn a screw of the sinker without cutting lead to adjust a float by controlling buoyancy in the sinker. As such, the present invention is capable of maximizing the convenience of float adjustment and protecting the environment.COPYRIGHT KIPO 2017공기 부력을 이용한 봉돌
