SENSOR CHIP AND METHOD FOR STORING SENSOR CHIP

[Problem] The present invention provides: a sensor chip in which occurrence of defects on a metal thin film, such as circular protrusions, can be reduced and a reduction in the assay performance of the sensor chip caused by such defects can be thereby suppressed; and a method of storing a sensor chip. [Means for Solution] Provided is a sensor chip comprising: a transparent support; a metal thin film formed on one surface of the transparent support; and a reaction section in which a ligand is immobilized on the other surface of the metal thin film that is not in contact with the transparent support, wherein the sensor chip also comprises a closed space-forming member which forms a closed space such that at least the reaction section is housed in the closed space, and the water content in the closed space is adjusted to satisfy: X/Y < 10 (µg/mm 2 ) (wherein, X represents the water content in the closed space; and Y represents the surface area of the metal thin film in the closed space).