[Problem] To provide a sensor chip for SPFS measurement that can cause a highly accurate and accurate SPFS measurement with little variation in characteristics such as signal, noise, and detection sensitivity depending on environmental conditions, ensuring quantitativeness. [Solution] An SPFS measurement sensor chip including a dielectric member constituting a prism manufactured by injection molding of a resin, the excitation light incident surface of the dielectric member, and the metal thin film forming surface of the dielectric member And a resin injection port disposed on one side end surface of the dielectric member that intersects the reflected light exit surface from which the reflected light is emitted, and the side end surface of the resin injection port as viewed from the metal thin film forming surface side of the dielectric member When the distance from the position to the position farthest from the side end surface position of the resin injection port on the metal thin film forming surface is b, the distance between the position of the side end surface of the resin injection port is 3b / 8 to 6b / 8. The center of the ligand fixing part, which is the reaction part, is positioned.
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