noun
Refers to the person who earns the income that supports a household, or more broadly a diligent earner. The 'hard worker' sense is a natural extension.
彼は一家の稼ぎ人だ。
He is the breadwinner of the family.
彼女は本当に稼ぎ人で、毎日遅くまで働いている。
She is a real hard worker, working late every day.