noun
department head; division manager
A formal business title for the person in charge of a department or division within an organization.
彼は営業部の部門長に昇進した。
He was promoted to head of the sales department.
部門長会議は毎週月曜日に開かれる。
The department heads' meeting is held every Monday.
課長 is a section chief, typically a lower rank than 部門長, which oversees a larger department or division.
Compound of 部門 (department, division) and 長 (head, chief). A straightforward Sino-Japanese title.