Patent ID: 8149410

Claim:
A detecting device for detecting a target substance or measuring an amount of the target substance in a sample by localized surface plasmon resonance, comprising: a detecting unit including a support, plural metal structures placed on the support and a trapping body for trapping the target substance in the sample; a light irradiation member for emitting light to irradiate the detecting unit; and a localized surface plasmon detector for detecting a signal based on localized surface plasmon generated by light irradiation to the detecting unit, wherein the plural metal structures are arranged one-dimensionally to form a transmission path on which the localized surface plasmon is one-dimensionally transmitted, and wherein the localized surface plasmon detector is provided at a position capable of detecting a signal based on the localized surface plasmon transmitted on the transmission path, wherein the localized surface plasmon detector includes a light detector for detecting the light based on the localized surface plasmon, and the light based on the plasmon transmitted on the transmission path is received by the light detector, and wherein the light detector has a part for converting the light based on the localized surface plasmon transmitted on the transmission path to far-field light and photoelectrically converts the converted far-field light.