VENTILATION COMPONENT

A ventilation component () includes a gas-permeable membrane (), a ventilation valve (), and a structural member (). The ventilation component () is to be attached to a housing () having a ventilation opening (). The ventilation valve () includes an elastic body, and is opened and closed by elastic deformation of the elastic body. The structural member () supports the gas-permeable membrane () and the ventilation valve (). In an attached state where the ventilation component () is attached to the housing (), ventilation between an inside of the housing () and an outside of the housing () is carried out via the gas-permeable membrane (), and the ventilation valve () is opened to discharge a gas inside the housing to the outside of the housing when a difference between a pressure inside the housing () and a pressure outside the housing () is equal to or higher than a predetermined value. The elastic body included in the ventilation valve () is formed of a rubber whose rate of change in breaking strength is 95% to 120%.