The divisions of the Research Bureau are mostly divided into smaller groups by topics that correspond to the structure of the standing committees of both houses, and legislative reference activity based on requests from Diet members and anticipatory research on current issues are conducted.
調査部門の各課はおおむね国会両院の常任委員会の構成に対応する主題別に細分されており、国会議員の問い合わせに応じて調査を行う立法レファレンス業務や、時事的な問題についての予備調査を行う。