A liquid storage container (eyedrops container) comprises a container body having a liquid storage portion for containing medical liquid therein, and an instilling portion for allowing the medical liquid to flow out in an opened stage. An aerating device having a filter element and a check valve for allowing ambient air to flow in from outside and preventing the liquid from flowing out to the outside is installed at the bottom of the container body. Further, a cap having an opening member and a valve member is mountable on the container body.