The move comes ahead of next month's summit of the Group of Eight rich nations on the northern island of Hokkaido, home to most of Japan's estimated 70,000 Ainu.
Japan's parliament is scheduled to adopt a resolution on Friday to urge the government to "immediately" provide support for the Ainu, who have long faced discrimination and income disparity, lawmakers said.
The resolution to be submitted jointly by ruling and opposition lawmakers stipulates for the first time that the Ainu "are an indigenous people with a distinct language, religion and culture."
In May, representatives of the world's 370 million indigenous people, closing up a two-week session at the United Nations, demanded a say in decisions on global warming, saying they were suffering the worst impact.
So the world population of indigenous people is 370 million, eh? That's good to know.