assistant section manager; assistant department manager
A corporate title for a deputy or assistant manager of a section or department. The exact rank varies by company, but it is typically one step below 部長 (department manager).
He was promoted to assistant department manager this year.
As assistant section manager, I am in charge of preparing for meetings.
Compound of 出席 (attendance, presence) and 部長 (department manager). The exact origin of the title is uncertain, but it likely refers to a manager who attends meetings or represents the department in the absence of the 部長.