Four species of bats, Rhinolophus cornutus cornutus, R. ferrumequinum nippon, Myotis macrodactylus and Plecotus auritus were collected in abandoned mines and limestone caves scattered in Yoshino-gun of Nara Prefecture. Ten species of helminth parasites were collected from 86 bats during a period from January 1983 to July 1984. The prevalence of parasites: Vampirolepis isensis and Hymenolepis rashomonensis (cestodes) were found in 11.6% of 86 bats, Stronglacantha rhinolophi and Rictularia rhinolophi (nematodes) in 22.1% and Mesothatrium japonicum, Acanthatrium isotomum, A. setoense, Pyenoporus rhinolophi, Prosthodendrium chilostonmm and Pr. yamizense (trematodes) in 18.5%.