admission gate; entrance gate; entrance
Refers to the physical gate or entrance point where admission is controlled, such as at a venue, event, or facility.
There was a long line at the admission gate of the concert venue.
Please show your ticket at the entrance gate.
出口 is an exit, the opposite of an entrance.
Compound of 入場 (にゅうじょう, 'admission') and 口 (ぐち, 'gate' or 'opening').