A wealthy person; someone who owns substantial assets or property.
彼は若くして大きな事業に成功し、立派な資産家になった。
He succeeded in a big business at a young age and became a considerable wealthy person.
その資産家は地域の病院に多額の寄付をした。
That wealthy person made a large donation to the local hospital.
資産家の間では、不動産投資が人気だ。
Real estate investment is popular among wealthy people.