To provide an antibacterial/antiviral composition having an effect that is satisfactorily immediate even when the monovalent copper compound content is low. An antibacterial/antiviral composition comprising a resin, an antibacterial/antiviral agent comprising monovalent copper compound microparticles coated with a dispersant, and a hydrophilic compound that is dispersed in the resin and lacks compatibility with the resin.本發明課題在於提供一種一價銅化合物的含量即使是低量，在即效性方面仍表現優良的抗菌/抗病毒性組成物。 解決手段為，抗菌/抗病毒性組成物係由樹脂、抗菌/抗病毒劑及親水性化合物所構成，其中該抗菌/抗病毒劑係由經分散劑被覆之一價銅化合物微粒子所構成；該親水性化合物係分散於樹脂中，且與樹脂不相溶。
