A purpose of the present invention is to provide a method to improve the visibility of the contents of a material containing a vinyl chloride-based resin molded body that has been subjected to electron beam irradiation sterilization, as well as to provide a medical material that has improved visibility of the contents thereof after electron beam irradiation sterilization. By including a stabilizer that contains 4-cyclohexene-1,2-dicarboxylic acid diester and/or 4,5-epoxycyclohexane-1,2-dicarboxylic acid diester, loss of transparency and staining that occur over time during and after electron beam irradiation sterilization can be reduced, and a medical material that contains a vinyl chloride-based resin molded body and has improved visibility of the contents thereof after electron beam irradiation sterilization can be obtained.
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