The purpose of the present invention is to provide a sensor area which can prevent the decrease in an assay signal and the increase in an assay blank in an surface plasmon-field enhanced fluorescence spectroscopy (SPFS) measurement. [Solution] The present invention provides an SPFS sensor chip characterized in that a purification area Is arranged upstream of a flow path for an SPFS measurement relative to the direction of flow and a sensor area is arranged downstream of the flow path.
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