office manager; purser
A title for a chief administrative officer in an office, hospital, school, or on a ship/aircraft. On a vessel, it refers to the purser.
The hospital's office manager is in charge of administrative management.
The ship's purser handles passenger accounts.
課長 is a section chief, a lower rank than 事務長 in many organizations.
Compound of 事務 (じむ, 'office work, administration') and 長 (ちょう, 'chief, head').