PURPOSE: A sealed fluid supplement injection structure and a product using the same are provided to easily fill a fluid container with fluid using a fluid inlet unit on a dual-membrane structure for extending the lifetime of the product. CONSTITUTION: A fluid supplement injection structure for a fluid container comprises the following: a container body including an internal space with an opening on one side, formed by fusing edges of two resin materials with elastic restoring force； fluid(13) filling the internal space with the predetermined pressure； a fusing unit(31a) formed by locating the edge of a shielding film(31) on one inner side of the container body, which is formed of a sealing unit obtained by fusing the opening on the container body； a dual-membrane structure(30) with a fluid inlet(31b) located inside the fusing unit for users to fill the fluid by piercing the fluid inlet with a syringe needle.본 발명은 밀봉된 유체용기 및 이를 이용한 제품에 관한 것으로, 특히 밀봉된 유체용기의 본체 일측을 통해 주사기를 이용하여 유체를 간편하게 보충할 수 있는 이중막 주입 구조를 갖도록 하여 사용 수명을 연장하여 사용할 수 있도록 하는 밀봉된 유체용기의 유체 보충 주입 구조 및 이를 이용한 제품에 관한 것이다.
