| 摘要 |
A mask is provided, which improves sealability between a closing area and a supporter wall part and makes the structure of the expiration valve simple. A mask comprises: a face lid part; a supporting plate(21) in which a through-hole is formed in the center; a supporter wall part(23) that is stood up from the plate side of the supporting plate to surround a through-hole of the closed loop cross-sectional configuration; a valve plate(24) which is fixed to the supporting plate through the fixed area so that the closing station can be settled in the cross-sectional view of the supporter wall part; and a protection cap(25) which is fixed to the supporting plate to surround the valve plate.
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