A plasmonic sensor in which a multilayer thin film structure and a nanostructure are combined is provided. The plasmonic sensor to which the multilayer thin film structure and the nanostructure are coupled is a multilayer dielectric thin film having a one-dimensional photonic band gap structure having defects, a metal thin film having a predetermined surface plasmon resonance condition, Dimensional nanoparticle structure layer formed on the metal thin film, a nanoparticle structure layer formed on the metal thin film, and an optical signal that is incident through the multilayer dielectric thin film, reflected by the nanoparticle layer, and then emitted through the multilayer dielectric thin film .
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