PROBLEM TO BE SOLVED: To provide a medical vinyl chloride resin composition which is excellent in cracking resistance and discoloration resistance to radiation sterilization, in particular, &gamma-ray sterilization, is excellent in extrusion moldability, has no problem in an elution test required for a medical material, and accordingly can be suitably used for a medical instrument such as a medical infusion set, a joint member of a medical blood circuit, and a medical rigid container.SOLUTION: A medical vinyl chloride resin composition contains a component (a) of 100 pts.mass of a vinyl chloride resin, and a component (b) of 1 pts.mass or more and less than 20 pts.mass of an isosorbide diester-based plasticizer.
