VENT PLUG

摘要

Provided is a vent plug having a structure in which a gas permeable membrane is hard to break. Specifically fabricated is a vent plug provided with a cylindrical member (1) having a through hole (1a), a supporter (2) provided so as to be continuous with the cylindrical member (1) and crossing the through hole (1a), and a gas permeable membrane (3) attached around the cylindrical member (1), wherein the gas permeable membrane (3) is held by the supporter (2), and a projecting portion (3a) that follows the shape of the supporter (2) is formed in the gas permeable membrane (3).