A person or company that hires workers and pays wages; the employer — the party that employs someone.
彼は小さな会社の雇い主だ。
He is the employer of a small company.
雇い主と給料について話し合った。
I discussed my salary with my employer.
雇い主の許可があれば休暇を取れる。
You can take time off if your employer allows it.