Casing member and method for manufacturing the same

摘要

A casing 2 constitutes a connector casing E required to have a sealing property, and the cover 2 is constituted by a cover main body 10 provided with, in its own part, a large vent hole H0 passing through the connector casing E in an inward and outward direction and having a predetermined inner diameter size; a permeable sheet S which has a property to permit permeation of a gas and to prevent permeation of a liquid and a solid, and is integrally joined to an outside peripheral part of the large vent hole H0 so as to cover the large vent hole H0 from its outside; and a cover member C which is disposed outside the permeable sheet S to cover the permeable sheet from its outside and a ring-shaped protrusion 22 of which is hermetically joined to the casing main body 10, and the cover member C1 is provided with a small vent hole H1 in its own inward and outward direction, which has an inner diameter smaller than the large vent hole H0 and connects the large vent hole H0 and the air through the permeable sheet S.