An electric measurement-type surface plasmon resonance sensor 510 comprises a plasmon resonance enhancing sensor chip 110 and an electrical measurement device 21. The plasmon resonance enhancing sensor chip 110 comprises a sensor chip 101 and a prism 1. In the sensor chip 101, an electrode 2, a silicon semiconductor film 3, and a plasmon resonance film electrode 4 are disposed in this order. In the plasmon resonance enhancing sensor chip 110, the prism 1, the electrode 2, the silicon semiconductor film 3, and the plasmon resonance film electrode 4 are disposed in this order. The electrical measurement device 21 measures an electric current or voltage directly from the electrode 2 and the plasmon resonance film electrode 4.
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