PURPOSE: To provide a microparticle detection system for detecting a microparticle in a short time.

CONSTITUTION: The microparticle detection system comprises a scattering light detecting optical system 4 for irradiating the surface 10 of an object 9 with a plurality of laser beams and detecting the light Ls scattered from a microparticle adhered to the surface 10, a scan mechanism section 2 for relatively displacing the object 9 and the optical system 4 and scanning the surface 10 by means of the laser beam, and a data processing section 3 for processing data detected by the optical system 4.