A bill acceptor includes a main body attached with a bill box at the back side, a transmission mechanism for carrying a bill or license into a passage in the main body for examination by a recognition unit inside the main body and returning the rejected bill or examined license and carrying the examined bill to the bill box, and a face panel, which is fastened to the front side of the main body and has an insertion slot for the insertion of a bill/license into the passage and a finger guide portion disposed at one lateral side of the insertion slot for the insertion of a finger to bias a jammed license out of the insertion slot.