The Ikea founder and his family are worth $33 billion (230 billion kronor), Forbes calculates.
Other Swedes to rank among the world's richest people include Stefan Persson, heir to clothes retailer H&M. Persson's $18 billion fortune puts him at 17th place on the list.
Tetra Pak heiress Birgit Rausing and her family have assets worth $11 billion, putting them at 55th place. Hans Rausing is at 73rd place with $9 billion.
Microsoft founder Bill Gates remains the richest man in the world, worth an estimated $56 billion. Investment guru Warren Buffett is in second place with a private fortune of $52 billion.
American men dominate the list. The richest woman in the world is Liliane Bettencourt, owner of French cosmetic giant L'Oreal. She come twelfth in the list of billionaires.