noun
entry pass; admission card; visitor's pass
A card or badge granting access to a building or facility, such as an office, museum, or event venue.
受付で入館証を受け取ってください。
Please pick up your entry pass at the reception desk.
入館証を首から下げて館内を見学した。
I toured the facility with an admission card hanging from my neck.
Compound of 入館 (entering a building) + 証 (certificate, proof).