noun
public relations department; PR section
Refers to the department or section within an organization responsible for public relations and communications.
彼は広報部に配属された。
He was assigned to the public relations department.
広報部が新しいキャンペーンを発表した。
The PR department announced a new campaign.
広報 refers to public relations in general or the activity itself, whereas 広報部 is the organizational unit.
Compound of 広報 (public relations) + 部 (department, division).