Amazon Japan, a unit of U.S. online retail giant Amazon.com Inc., and flea market app operator Mercari Inc. joined Keidanren on Friday, the organization said.
Keidanren, the country's top business lobby and whose membership mainly consists of major manufacturers, is apparently looking to reflect views of companies utilizing information and other advanced technologies in its policy proposals, as those firms have been increasing their presence in the business world.
Rapidly growing Mercari made a strong debut on the Tokyo Stock Exchange in June.
Last month, Keidanren, also known as the Japan Business Federation, revised its membership eligibility rules by lowering the net assets requirement from ¥1 billion ($8.8 million) or above to ¥100 million or more, so that a wide variety of companies can join, including many startups.
Internet retailer Rakuten Inc. had become a member of Keidanren in 2004 but it withdrew in 2011, citing differences in direction and philosophy.