A medical instrument housing container includes a container body including a substantially rectangular base, a peripheral wall having a lower end that is contiguous to a perimeter of the base and that extends upward, and a peripheral edge member that comprises a plurality of peripheral edges, that is contiguous to an upper end of the peripheral wall, and that extends outwardly, wherein the substantially rectangular base, the peripheral wall, and the peripheral edge member are molded from resin, and the container body has an opening surrounded by the peripheral edge member； a plurality of medical instruments held in the container body； and a protection film that is adhered or heat-sealed to the peripheral edge member for covering and sealing the opening. At least a portion of the peripheral edge member is curved inwardly. The protection film covers the opening in a flexed condition.
