<p>A liquid container, comprising a container body (1) forming a liquid storage space and a liquid filling port member (2). A sealing part (5) sealing a liquid and an unsealing part (6) unsealing the sealing part (5) are installed in the container body (1). A check valve (4) allowing the unsealing of the sealing part (5) by the unsealing part (6) when the liquid filling port member (2) is pushed to the container body (1) side and preventing the liquid from reversely flowing to the inside of the container body (1) is installed on the liquid storage space side of the sealing part (5) and the unsealing part (6).</p>
