noun
notary public's office
A government-authorized office where a notary public authenticates documents, administers oaths, and performs other official acts.
遺言書の認証を受けるために公証役場へ行った。
I went to the notary public's office to have my will authenticated.
公証人 is the notary public (the person), while 公証役場 is the office where the notary works.
Compound of 公証 (notarization) and 役場 (public office).