noun
A person who acts on behalf of another, often in legal, business, or formal contexts.
彼は社長の代行者として会議に出席した。
He attended the meeting as the president's proxy.
弁護士が依頼人の代行者として契
The lawyer signed the contract as the client's agent.
Compound of 代行 (daikō, 'acting on behalf of') + 者 (sha, 'person').