FLUID DETECTION SENSOR AND FLUID DETECTION DEVICE

A fluid detection sensor of the disclosure includes: an optical sensor including a light emitting element array including a plurality of light emitting elements and a light receiving element array including a plurality of light receiving elements, the light emitting element array and the light receiving element array being arranged on a substrate along a longitudinal direction of the substrate; a flow path member which includes a tubular body which is transparent and is arranged along the longitudinal direction facing the optical sensor, an inside of the tubular body constituting a flow path through which a plurality of substantially immiscible fluids flow as a slug flow; and a reflecting member placed on a side opposite to the optical sensor with respect to the flow path. The fluid detection sensor detects changes in light which occur in accordance with a movement of the plurality of fluids by the light receiving element array receiving light which is emitted by the light emitting element array toward the slug flow in the flow path and is reflected by the reflecting member.