A bat survey was carried out during July, August and September 2002, at Kitafushiko (42°52'N;143°8'E), Memuro-cho, in central Hokkaido. Five species of bats were caught in mist nets: Myotis macrodactylus, M. daubentonii, M. frater, Eptesicus nilssonii and Nyctalus aviator. M. frater used tree hollows for their daytime and maternity roosts during July and August.