Abstract: A microparticle detection system includes a stage unit including a mounting surface on which a fluid device having a flow path through which a sample containing microparticles is movable is capable of being mounted, an emission unit configured to emit illumination light to the flow path, an imaging unit configured to image scattered light generated from microparticles in the sample when illumination light is emitted, an identification unit configured to identify the microparticles included in the image for each of the microparticles on the basis of the image captured by the imaging unit, a particle size determination unit configured to determine a particle size of the microparticle for each of the microparticles identified by the identification unit, a zeta potential determination unit configured to determine a zeta potential of the microparticle for each of the microparticles identified by the identification unit, and a correlation unit configured to associate the particle size for each of the microparticles