A shape separator equipped with a vibrating rotating disk was developed, and its performance was investigated for irregularly shaped particles of 50-300 mu m in size under various operating conditions. The shape separation was examined from the shape analysis of sorted particles and found to be effective even for 50 mu m particles, By considering factors that obstruct the rolling motion of particles, it was confirmed that higher separation efficiencies could be obtained by minimizing the particle adhesion to the disk, the surface roughness of the disk and the degree of sliding or excessive bouncing of particles on the disk.