noun
Refers to the person in charge or the leading role in a group, team, or organization. Relatively formal and often used in professional or official contexts.
彼はプロジェクトの主班としてチームを率いた。
He led the team as the head of the project.
主班の指示に従って作業を進めてください。
Please proceed with the work according to the instructions of the person in charge.
Compound of 主 (しゅ, 'main' or 'head') and 班 (はん, 'group' or 'squad'). The exact historical derivation is uncertain, but the term is conventionally used to denote the leader of a group.