We here report the floristic composition and stand structure of Distylium racemosum mixed forests established in Miyajima Island, Hiroshima Prefecture, SW Japan. Our recent vegetation survey throughout the island recognized that the Distylium racemosum mixed forests were partially established in a valley of the south-facing slope of the island. The forests were considered to be remnants, whose persistence could possibly be attributed to the island's cultural history in which nature conservancy was a part of the worship and reverence for the island practiced by its inhabitants since ancient times.