In order to investigate the effects of particle properties, including particle shape, on packing characteristics of particles with tapping, changes in the void fraction epsilon in a tapping particle bed were measured using some materials differing in particle shape, size dp and density p. The particle shapes were characterized by image analysis of random-oriented particles and evaluated by a pair of shape indices, circularity <()over bar> and smoothness <()over bar>. As a result, it was confirmed that changes in the void fraction with tapping number n can be given by a simple equation: (epsilon - epsilon (f))/(epsilon (0) - epsilon (f)) = exp(-kn(q)). Furthermore, the effects of particle properties <()over bar>, <()over bar>,(dp) over bar and rho on the initial and final void fractions so and sc in a packed bed, and on the parameters k and q were clarified by multiple regression analysis of the experimental results.