Provided is an electrical measurement-type surface plasmon resonance sensor provided with: a sensor chip in which a transparent electrode, an n-type transparent semiconductor film, a plasmon resonance film electrode, and a reflection resonance film are disposed in this order; a plasmon polariton enhanced sensor chip in which a prism is disposed in the order of the prism, the transparent electrode, the n-type transparent semiconductor film, the plasmon resonance film electrode, and the reflection resonance film; and an electrical measurement device which directly measures a current value or a voltage value from the transparent electrode and the plasmon resonance film electrode.
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