person in charge; person responsible; contact person
Refers to the specific person assigned to handle a task, area, or client. Common in business, administrative, and service contexts.
この件の担当者を教えてください。
Please tell me who is in charge of this matter.
担当者が不在で、詳しい話が聞けなかった。
The person in charge was absent, so I couldn't get detailed information.
I'll check with the person in charge of this matter.
Please contact the person in charge for details.
The person in charge will respond to the customer's questions.
Due to sudden circumstances, we had to change the person in charge.
担当者 is a general term for whoever is in charge of a task, while 事務当局 specifically refers to administrative officials or bureaucratic authorities.