The meeting is one of several precursors to Japan's eighth Pacific Islands Leaders Meeting or PALM to be held in 2018.
Japan has been holding the summit every three years since 1997.
16 countries are expected to attend the meeting which will review progress since the last summit and prepare for the next one.
Speaking on behalf of the Pacific Islands Forum chair the Federated States of Micronesia's foreign secretary, Lorin Robert, said he was looking forward to discussing the Pacific's relations with Japan in the areas of climate change and ocean management.
In a statement the Forum secretariat said, in the context of sustainable development, Pacific island countries were also seeking Japan's support through the World Bank for an expansion of the definition of "fragility" to include vulnerability to climate change, economic equity, access, and geographical and environmental challenges.