noun
public relations department; PR office
Refers to the section or room within an organization responsible for public relations and media communications.
広報室に問い合わせてください。
Please contact the public relations department.
彼は広報室で働いています。
He works in the PR office.
広報課 is a public relations section, typically a subdivision within a larger department, whereas 広報室 may be a standalone office.
Compound of 広報 (こうほう, 'public relations') and 室 (しつ, 'room' or 'office').