Patent ID: 8475554

Claim:
A permeable member that is fixed to a casing so as to cover an opening of the casing, which comprises: a permeable film through which a gas, which passes through the opening of the casing to which the permeable member is fixed, passes; and a tubular support that supports the permeable film, wherein the permeable film is arranged on an end face of the tubular support, the end face is an upstream end face with respect to the gas flowing into the casing when the permeable member is fixed to the casing, the permeable member further comprises a protective cover that covers the permeable film, wherein the protective cover is supported by the tubular support at at least one portion of the tubular support selected from the group consisting of the end face thereof and an outer circumference plane thereof so that a space is formed between the permeable film and the protective cover, the tubular support includes a first resin part and a second resin part, the first resin part of the tubular support contacts the casing to which the permeable member is fixed, a material forming the second resin part has a higher elastic modulus than a material forming the first resin part, and the first resin part and the second resin part are laminated at least partly at a sidewall of the tubular support when viewed in a transverse section of the tubular support.