An administrative body or organ — a public organization (national or local) that performs administrative functions, such as government offices or ministries.
行政機関に申請書を提出してから審査に数週間かかると言われた。
I was told that after submitting the application to the administrative body, the review would take several weeks.
新しい規則は複数の行政機関で協議された上で決まった。
The new regulation was decided after consultations among several administrative bodies.
行政機関の窓口で必要な書類について確認した。
I checked the required documents at the administrative office counter.