Provided is a technique that enables openings for injecting liquid to be sealed with a simple and low-cost configuration. A liquid reservoir container includes: a reservoir portion configured to contain liquid in an inside of the reservoir portion and having multiple openings communicating with the inside; a supply portion connected to at least one of the openings and configured to supply liquid to the reservoir portion from a tank reserving the liquid via a flow path; and a sheet member. The liquid reservoir container supplies liquid reserved in the reservoir portion to an ejecting portion configured to eject liquid, and the sheet member is attached to the reservoir portion so as to seal an opening to which the supply portion is not connected of the multiple openings.