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. (December 2009)
Hachikai (八開村, Hachikai-mura) was a village located in Ama District, Aichi Prefecture, Japan.
As of 2003, the village had an estimated population of 4,930 and a density of 404.43 persons per km². The total area was 12.19 km².
On April 1, 2005, Hachikai, along with the towns of Saya and Saori, and the village of Tatsuta (all from Ama District), was merged to create the city Aisai.