noun
honest person; person of integrity; straight shooter
Refers to a person who is fundamentally honest and straightforward, often implying a simple, guileless nature. Can carry a slightly naive or overly trusting connotation in some contexts.
彼は正直者だから、嘘はつかない。
He's an honest person, so he doesn't lie.
正直者が馬鹿を見ることもある
Sometimes honest people get the short end of the stick.