Patent ID: 8414672

Claim:
A ventilation member, comprising: a tubular part, in an interior of which a gas passage for an object that needs ventilation is formed; a gas permeable filter disposed at one of openings of the tubular part; and a cover part, inside of which the tubular part is fit, wherein: the tubular part includes a connection-end opening, which is an opening on a side on which the object is to be connected, a filter-end opening, which is an opening closed by the gas permeable filter, and a body portion positioned between the connection-end opening and the filter-end opening; the cover part includes a bottom portion that faces the gas permeable filter in an attached state where the tubular part is fit inside from a side of the gas permeable filter and a side wall portion that extends from the bottom portion so as to surround the filter-end opening and the body portion from outside; in the attached state, a first gap is formed between the bottom portion of the cover part and the gas permeable filter, and a second gap is formed on an outer side of the tubular part and between the side wall portion of the cover part and the body portion of the tubular part, the first and second gaps functioning as a gas passage that communicates the filter with an exterior; an opening area of the filter-end opening with respect to an in-plane direction perpendicular to a thickness direction of the gas permeable filter is larger than an opening area of the connection-end opening with respect to the in-plane direction, the most narrow point of the opening area of the filter end opening being larger than the widest point of the opening area of the connection end opening; the opening area of the filter-end opening and the opening area of the connection-end opening being positioned at a same side of the gas permeable filter; the gas permeable filter has a first surface that faces the bottom portion and a second surface that is opposite to the first surface; and the opening area of the filter-end opening being defined as a contact area between the gas passage in the interior of the tubular part and the second surface.