To provide a sphericity classifying machine for a fine particle which is capable of classifying fine particles according to the sphericity without inclusion of defective products into acceptable products even if the fine particles are supplied at a high particle supply speed.

The fine particles 50 are dropped on a plurality of particle dropping plates 22A-20C individually having different inclination angles with giving the plates lateral vibration, and the defective product having an unacceptable sphericity is caused to separate widely from the acceptable product by the lateral vibration when the defective product falls on the particle dropping plate having a gentle inclination. Therefore, even if the defective product should stray in a case of supplying the particles at a high supply speed, the defective product is prevented from being included in the acceptable products.