A person who provides guidance, instruction, or coaching in a structured setting such as a school, club, training program, or workplace.
He serves as an instructor for new employees.
自動車学校の指導員はとても親切だった。
The driving school instructor was very kind.
Compound of 指導 (しどう, 'guidance') and 員 (いん, 'member' or 'personnel'), literally 'guidance person'.