There is provided a medical container for accommodating a protein solution formulation which does not cause the denaturation of a protein contained in the protein solution formulation, including the oxidization of amino acid residues in the protein； a packed protein solution formulation in which a protein solution formulation is accommodated in the medical container； and a packaged product of a packed protein solution formulation, in which the deterioration in quality or deactivation of the protein solution formulation which is caused by the oxidization, polymerization, and anionization of the protein can be prevented more effectively.A cycloolefin polymer-made medical container which is sterilized with high-pressure steam, has an effect of preventing the oxidization of amino acid residues in a protein, and accommodates a protein solution formulation and；a cycloolefin polymer-made medical container which is sterilized with high-pressure steam, has a radical content of 2.2 × 1015 radical/g or less as measured using an electron spin resonance spectrometer, and accommodates a protein solution formulation；a packed protein solution formulation in which a protein solution formulation is accommodated in the medical container； a deoxygenated packaged product in which the packed protein solution formulation and a deoxygenating agent are packaged in a poorly oxygen-permeable packaging material； and the deoxygenated packaged product which is packaged in a packaging material having a light-blocking property.
