Provided is an antimicrobial device exhibiting antimicrobial properties over a long period of time. An antimicrobial device (20) is provided with: a substrate (51)； a first electrode (52) formed on the substrate (51)； a second electrode (53) formed on the substrate； and a protective layer (59) disposed so as to cover the first electrode (52) and the second electrode (53), the protective layer (59) having a first surface disposed on the substrate (51) side thereof and a second surface disposed on the reverse side thereof from the substrate (51) side； the electric field strength in the second surface of the protective layer (59) being 150 kV/m or greater.
