Liquid storage container and method for manufacturing liquid storage container

A method of manufacturing a liquid storage container that stores a liquid, the liquid storage container including a puncture port puncturable by a puncture instrument including a needle tube portion having a through hole provided therein, a liquid discharge portion, and a liquid accommodation portion, the method comprising:

• an insertion step of inserting a portion or all of a second port member into a first port member in a state in which an opening on one other end portion of the first port member having one end portion closed by a first partition and an opening on one other end portion of the second port member having one end portion closed by a second partition face in a same direction;
• a providing step of providing the first port member and the second port member between a set of sheet-shaped members overlapped in an opposite manner after the insertion step;
• a welding step of welding a portion where the first port member, the second port member, and the set of sheet-shaped members overlap after the providing step;
• and
• a liquid accommodation portion forming step of welding peripheral edge portions of the set of sheet-shaped members to form the liquid accommodation portion on a side where the openings of the first port member and the second port member are located,
• wherein the liquid accommodation portion forming step further includes welding the set of sheet-shaped members to include the portion welded in the welding step.