Ventilation member

1. A ventilation member to be mounted to a housing, comprising:

a gas permeable membrane;

a support body for supporting the gas permeable membrane, the support body being configured to form a ventilation passage from an opening of the housing to the gas permeable membrane when the support body is fixed to the housing; and

a sealing element for sealing between the housing and the support body at a position surrounding the opening,

wherein the support body includes: a main portion having a front surface on which the gas permeable membrane is attached and a back surface for pressing the sealing element against the housing; and a plurality of leg portions extending from the back surface of the main portion so that the leg portions can be inserted into the opening, the leg portions each having, at its end, a hook to be caught by the housing, and

the main portion has, at positions corresponding to the hooks in a direction in which the leg portions are inserted, through-holes through which the hooks are exposed as seen from a side of the front surface of the main portion, and the through-holes and gaps between the adjacent leg portions form the ventilation passage.

2. The ventilation member according to claim 1 , wherein

the leg portions extend obliquely so as to spread outwardly with increasing distance from the main portion, and the hook is formed on an outer surface of the leg portion directed toward the back surface of the main portion, and

the outer surface of the leg portion also is exposed through the through-hole as seen from the side of the front surface of the main portion.

3. The ventilation member according to claim 1 , wherein the front surface of the main portion has, at a position surrounding the gas permeable membrane, a receding portion receding toward the back surface with increasing distance from the gas permeable membrane.

4. The ventilation member according to claim 1 , wherein the support body further includes a peripheral wall portion surrounding the sealing element.

5. The ventilation member according to claim 4 , wherein the support body further includes a second peripheral wall portion forming an accommodation groove for accommodating the sealing element, together with the peripheral wall portion and the main portion.

6. The ventilation member according to claim 1 , wherein the front surface of the main portion has a recess for forming a space between the main portion and the gas permeable membrane, and all of the through-holes open to a bottom of the recess.

7. The ventilation member according to claim 1 , further comprising a cover body for covering the gas permeable membrane from a side opposite to the support body,

wherein the cover body has: a ceiling portion facing the gas permeable membrane; a side wall portion extending from a peripheral portion of the ceiling portion in a direction toward the support body; and a plurality of projecting portions projecting from the side wall portion in the direction toward the support body, and

the projecting portions are fixed to the support body so as to form a gap between the side wall portion and the support body, through which a space defined inside the cover body along the gas permeable membrane communicates with an outside.

8. The ventilation member according to claim 7 , wherein the side wall portion extends beyond the gas permeable membrane in the direction toward of the support body.

9. The ventilation member according to claim 7 , wherein an inner peripheral surface of the side wall portion has an inclined surface on its edge located closer to the support body.

10. The ventilation member according to claim 1 , wherein the gas permeable membrane includes a porous resin membrane.

11. The ventilation member according to claim 10 , wherein the porous resin membrane is liquid repellent-treated.