In some fiddler crabs (genus Uca), males produce visual signals by claw waving. Claw wavings are signals for mate attraction and used to orient conspecific females towards the male from short and long distances. However, in the dotillid crab Ilyoplax pusilla, the function of waving signals is obscure because, more often, males do not direct their waves at any particular individual. And Males waved significantly more often when surrounded by other males than when surrounded by females. We conducted two types of female-release experiment to investigate the response by wandering females to artificial waving signals (claw models), one is the choice experiment between waving and static claws, another is the choice experiment between small and large waving claws. Moreover, females were released from long and short distance in both experiments. In these experiments, females chose more often waving models than static models, and more often large claw waving models than small claw waving models. Moreover, in both experiments, the tendency was clearer in short distance choice than long distance choice. These results indicate that large claw wavings from a short distance are most effective.