A plasmon resonance device 100 according to an example of a structure is characterized in that metallic particles 7 isolated from each other are formed in each of a plurality of pores 5 of anodic oxidized alumina 3. As a method of manufacturing the plasmon resonance device 100, a metal is coated on the anodic oxidized alumina 3 opening the pores 5 and a metal coated element provided on the opening surface of the pore in the anodic oxidized alumina 3 is removed. Consequently, metallic particles isolated from each other are formed in the respective independent pores. The plasmon resonance device 100 can be used as a sensor utilizing a localized plasmon resonance phenomenon.