Liquid dispensing device according to the present invention (10), as a closing member for closing the air passage in which air flows toward the internal liquid reservoir (12) from the outside (26), the air flow path (26) , and isolated so as not to contact with the liquid to be contained above the liquid reservoir (12), the air diffusing member is formed of a non-porous polymeric material having air permeability (30), the air diffusing member (30) comprises isolating casing for (32), the isolating casing (32), as it is characterized by having (54) ventilation components to pass air toward the interior of (12) above the liquid reservoir there.本発明に係る液体分注装置(10)は、外部から液体リザーバ(12)の内部に向けて空気が流れる空気流通路(26)と、上記空気流通路(26)を閉塞する閉塞部材としての、通気性を有する非多孔性ポリマー材料で形成された空気拡散部材(30)と、上記空気拡散部材(30)を、上記液体リザーバ(12)内に収容される液体に接触させないように隔離するための隔離用ケーシング(32)とを備え、上記隔離用ケーシング(32)は、上記液体リザーバ(12)の内部に向けて空気を通過させる通気部品(54)を有することを特徴とするものである。
