A document granting permission to pass through a restricted area, such as a backstage pass, security pass, or gate pass. Often used in official or event contexts.
See also: 通行証 (つうこうしょう)
A pass is required for anyone other than authorized personnel.
コンサートの楽屋に入るには通行許可証を見せてください。
Please show your backstage pass to enter the dressing room at the concert.
通行証 is a more general term for a pass or permit, while 通行許可証 specifically emphasizes official permission (許可) to pass.
Compound of 通行 (passage) + 許可 (permission) + 証 (certificate).