The Tokyo government and authorities in Okinawa have long been at loggerheads over relocation of the US Marines' Futenma air base, which is in an urban area of the island.
Tokyo has been seeking to move the base to a less populated area of the same island, called Henoko, but Onaga wanted the base off the island altogether. Delays in relocating the base have been an irritant in US-Japan relations.
Japanese inventors step up to offer relief from sweltering heat
Okinawa, the site of a bloody World War Two land battle, hosts the bulk of US military forces in Japan, and many residents resent what they see as an unfair burden.
A gubernatorial election will be held within 50 days after the Okinawa's election administration commission is officially notified of the death of the incumbent governor, an Okinawa official said.
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