I'm talking about the "cultural" ones, because with the yen currency the scale is completely different (millionnaire with yen is only about having approximately 10 000 usd so I don't think it's the real equivalent).
2 Answers
億万長者【おくまんちょうじゃ】 is the best-known word. Actually there is also a word 百万長者, but it's not commonly used for the obvious reason.
ミリオネア is at least understood because of this TV program, but it's not used in daily conversations.
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億万長者 is a word that just means " rich person" without referring especially to an amount of money ?– JireiMay 1, 2018 at 16:43
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1@Jirei I assume an 億万長者 has at least 100M yen, but basically it vaguely refers to a super-rich person. Bill Gates is still safely an 億万長者, too.– narutoMay 1, 2018 at 16:51
There is also the word [大富豪]{だい・ふ・ごう}, but I don't know if it's commonly used other than for the card game.
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It is definitely used in the 'extremely rich person' meaning. I don't think it's terribly uncommon, though my intuition might not be reliable on that point. At any rate, I learned in context with that meaning, and you can find plenty of examples in BCCWJ.– user1478Jul 19, 2018 at 19:48