A disclosed liquid container containing liquid to be supplied to a liquid discharge head includes a container main body defining a liquid containing section and including an opening section formed in one surface of the container main body, the opening section including an opening; and a film-like flexible member sealing the opening section of the container main body. Further, the film-like flexible member is joined with a joint section formed on the opening section of the container main body in a state where the film-like flexible member is bent, and a concave-convex structure is formed in the circumferential direction of the joint section.